diff --git a/modules/openapi-generator/src/main/resources/kotlin-spring/formParams.mustache b/modules/openapi-generator/src/main/resources/kotlin-spring/formParams.mustache
index 3d1a5787e382..c6eb0799686a 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-spring/formParams.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-spring/formParams.mustache
@@ -1 +1 @@
-{{#isFormParam}}{{^isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}{{#defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]{{^isContainer}}, defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/isContainer}}){{/defaultValue}}{{/allowableValues}}{{#allowableValues}}{{^defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]){{/defaultValue}}{{/allowableValues}}{{^allowableValues}}{{#defaultValue}}{{^isContainer}}, schema = Schema(defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}){{/isContainer}}{{/defaultValue}}{{/allowableValues}}){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}, allowableValues = "{{#values}}{{{.}}}{{^-last}}, {{/-last}}{{/values}}"{{/allowableValues}}{{#defaultValue}}, defaultValue = "{{{.}}}"{{/defaultValue}}){{/swagger1AnnotationLibrary}} {{#isModel}}@RequestPart{{/isModel}}{{^isModel}}@RequestParam{{/isModel}}(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}} {{/isFile}}{{#isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "file detail"){{/swagger1AnnotationLibrary}} {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestPart("{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}}{{/isFile}}{{/isFormParam}}
\ No newline at end of file
+{{#isFormParam}}{{^isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}{{#defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]{{^isContainer}}, defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/isContainer}}){{/defaultValue}}{{/allowableValues}}{{#allowableValues}}{{^defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]){{/defaultValue}}{{/allowableValues}}{{^allowableValues}}{{#defaultValue}}{{^isContainer}}, schema = Schema(defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}){{/isContainer}}{{/defaultValue}}{{/allowableValues}}){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}, allowableValues = "{{#values}}{{{.}}}{{^-last}}, {{/-last}}{{/values}}"{{/allowableValues}}{{#defaultValue}}, defaultValue = "{{{.}}}"{{/defaultValue}}){{/swagger1AnnotationLibrary}} {{#useBeanValidation}}@Valid{{/useBeanValidation}} {{#isModel}}@RequestPart{{/isModel}}{{^isModel}}@RequestParam{{/isModel}}(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}} {{/isFile}}{{#isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "file detail"){{/swagger1AnnotationLibrary}} {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestPart("{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}}{{/isFile}}{{/isFormParam}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/php-dt/README.md.mustache b/modules/openapi-generator/src/main/resources/php-dt/README.md.mustache
index 605c5d461c8a..7c2a3ef3df24 100644
--- a/modules/openapi-generator/src/main/resources/php-dt/README.md.mustache
+++ b/modules/openapi-generator/src/main/resources/php-dt/README.md.mustache
@@ -5,7 +5,7 @@ Generated by the [OpenAPI Generator](https://openapi-generator.tech) project.
 ## Overview
 This lightweight extensible client library is [PSR-7](https://www.php-fig.org/psr/psr-7), [PSR-11](https://www.php-fig.org/psr/psr-11), [PSR-17](https://www.php-fig.org/psr/psr-17) and [PSR-18](https://www.php-fig.org/psr/psr-18) complaint and relies on:
 
-- PHP: >=7.4
+- PHP: >=8.1
 - [Data Transfer](https://github.com/Articus/DataTransfer): >=0.6
 
 
diff --git a/modules/openapi-generator/src/main/resources/php-dt/composer.json.mustache b/modules/openapi-generator/src/main/resources/php-dt/composer.json.mustache
index 6a08a9cb8003..8a2c932cf485 100644
--- a/modules/openapi-generator/src/main/resources/php-dt/composer.json.mustache
+++ b/modules/openapi-generator/src/main/resources/php-dt/composer.json.mustache
@@ -18,7 +18,7 @@
     "version": "{{artifactVersion}}",
     "type": "library",
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.1",
         "articus/data-transfer": "^0.6",
         "articus/openapi-generator-common": "^0.3",
         "articus/openapi-generator-apiclient": "^0.2",
@@ -36,4 +36,4 @@
         "nyholm/psr7": "^1.8",
         "symfony/http-client": "^5.4"
     }
-}
\ No newline at end of file
+}
diff --git a/modules/openapi-generator/src/main/resources/php-flight/composer.mustache b/modules/openapi-generator/src/main/resources/php-flight/composer.mustache
index d922daab923e..fdbe33b8e348 100644
--- a/modules/openapi-generator/src/main/resources/php-flight/composer.mustache
+++ b/modules/openapi-generator/src/main/resources/php-flight/composer.mustache
@@ -17,7 +17,7 @@
   ],
   "type": "library",
   "require": {
-    "php": "^8.1.0",
+    "php": "^8.1",
     "flightphp/core": "^3.5.1",
     "ext-json": "*"
   },
diff --git a/modules/openapi-generator/src/main/resources/php-laravel/composer.mustache b/modules/openapi-generator/src/main/resources/php-laravel/composer.mustache
index 82bac49894cd..0592ec1a4240 100644
--- a/modules/openapi-generator/src/main/resources/php-laravel/composer.mustache
+++ b/modules/openapi-generator/src/main/resources/php-laravel/composer.mustache
@@ -24,7 +24,7 @@
         }
     ],
     "require": {
-        "php": ">=8.1",
+        "php": "^8.1",
         "laravel/framework": "^10.0",
         "crell/serde": "^1.0"
     },
diff --git a/modules/openapi-generator/src/main/resources/php-lumen/composer.mustache b/modules/openapi-generator/src/main/resources/php-lumen/composer.mustache
index e6835f692223..ea6c3f4a6789 100644
--- a/modules/openapi-generator/src/main/resources/php-lumen/composer.mustache
+++ b/modules/openapi-generator/src/main/resources/php-lumen/composer.mustache
@@ -24,7 +24,7 @@
     ],
     "type": "project",
     "require": {
-        "php": "^7.2.5",
+        "php": "^8.1",
         "laravel/lumen-framework": "^7.2"
     },
     "require-dev": {
diff --git a/modules/openapi-generator/src/main/resources/php-mezzio-ph-modern/README.md.mustache b/modules/openapi-generator/src/main/resources/php-mezzio-ph-modern/README.md.mustache
index fd66369b261a..ea26b0bac4a7 100644
--- a/modules/openapi-generator/src/main/resources/php-mezzio-ph-modern/README.md.mustache
+++ b/modules/openapi-generator/src/main/resources/php-mezzio-ph-modern/README.md.mustache
@@ -5,7 +5,7 @@ Generated by the [OpenAPI Generator](https://openapi-generator.tech) project.
 ## Overview
 This server stub aims to provide light, yet comprehensive structure for your API project using:
 
-- PHP: >=8.0
+- PHP: >=8.1
 - [Laminas Mezzio](https://docs.mezzio.dev/mezzio/): >=3.3
 - [Path Handler](https://github.com/Articus/PathHandler): >=0.7
 
diff --git a/modules/openapi-generator/src/main/resources/php-mezzio-ph-modern/composer.json.mustache b/modules/openapi-generator/src/main/resources/php-mezzio-ph-modern/composer.json.mustache
index aff61e1f25cd..f7dd2832b423 100644
--- a/modules/openapi-generator/src/main/resources/php-mezzio-ph-modern/composer.json.mustache
+++ b/modules/openapi-generator/src/main/resources/php-mezzio-ph-modern/composer.json.mustache
@@ -18,7 +18,7 @@
     "version": "{{artifactVersion}}",
     "type": "project",
     "require": {
-        "php": "^8.0",
+        "php": "^8.1",
         "ext-yaml": "^2.2",
         "mezzio/mezzio": "^3.3",
         "laminas/laminas-diactoros": "^2.5",
@@ -36,4 +36,4 @@
             "": "src/"
         }
     }
-}
\ No newline at end of file
+}
diff --git a/modules/openapi-generator/src/main/resources/php-mezzio-ph/README.md.mustache b/modules/openapi-generator/src/main/resources/php-mezzio-ph/README.md.mustache
index a80470059016..d0fb8aebf1f7 100644
--- a/modules/openapi-generator/src/main/resources/php-mezzio-ph/README.md.mustache
+++ b/modules/openapi-generator/src/main/resources/php-mezzio-ph/README.md.mustache
@@ -5,7 +5,7 @@ Generated by the [OpenAPI Generator](https://openapi-generator.tech) project.
 ## Overview
 This server stub aims to provide light, yet comprehensive structure for your API project using:
 
-- PHP: >=7.3
+- PHP: >=8.1
 - [Laminas Mezzio](https://docs.mezzio.dev/mezzio/): >=3.2
 - [Path Handler](https://github.com/Articus/PathHandler): >=0.7
 
diff --git a/modules/openapi-generator/src/main/resources/php-mezzio-ph/composer.json.mustache b/modules/openapi-generator/src/main/resources/php-mezzio-ph/composer.json.mustache
index b7c25a283ce1..c4202b148762 100644
--- a/modules/openapi-generator/src/main/resources/php-mezzio-ph/composer.json.mustache
+++ b/modules/openapi-generator/src/main/resources/php-mezzio-ph/composer.json.mustache
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "php": "^7.3 || ^8.0",
+        "php": "^8.1",
         "ext-yaml": "^2.0",
         "mezzio/mezzio": "^3.2",
         "laminas/laminas-diactoros": "^2.1",
@@ -37,4 +37,4 @@
             "": "src/"
         }
     }
-}
\ No newline at end of file
+}
diff --git a/modules/openapi-generator/src/main/resources/php-slim4-server/README.mustache b/modules/openapi-generator/src/main/resources/php-slim4-server/README.mustache
index dd5fb2531842..58312402e3ed 100644
--- a/modules/openapi-generator/src/main/resources/php-slim4-server/README.mustache
+++ b/modules/openapi-generator/src/main/resources/php-slim4-server/README.mustache
@@ -20,7 +20,7 @@ This server has been generated with [Laminas (Zend) PSR-7 implementation](https:
 ## Requirements
 
 * Web server with URL rewriting
-* PHP 7.4 or newer
+* PHP 8.1 or newer
 
 This package contains `.htaccess` for Apache configuration.
 If you use another server(Nginx, HHVM, IIS, lighttpd) check out [Web Servers](https://www.slimframework.com/docs/v3/start/web-servers.html) doc.
diff --git a/modules/openapi-generator/src/main/resources/php-slim4-server/composer.mustache b/modules/openapi-generator/src/main/resources/php-slim4-server/composer.mustache
index c2825b4f8d09..75ae6d6dac7a 100644
--- a/modules/openapi-generator/src/main/resources/php-slim4-server/composer.mustache
+++ b/modules/openapi-generator/src/main/resources/php-slim4-server/composer.mustache
@@ -22,7 +22,7 @@
     }
   ],
   "require": {
-    "php": "^7.4 || ^8.0",
+    "php": "^8.1",
     "dyorg/slim-token-authentication": "dev-slim4",
     {{#isGuzzlePsr7}}
     "guzzlehttp/psr7": "^1.6.1",
diff --git a/modules/openapi-generator/src/main/resources/php-slim4-server/github_action.yml.mustache b/modules/openapi-generator/src/main/resources/php-slim4-server/github_action.yml.mustache
index d75108d3a368..6709f78fcfa5 100644
--- a/modules/openapi-generator/src/main/resources/php-slim4-server/github_action.yml.mustache
+++ b/modules/openapi-generator/src/main/resources/php-slim4-server/github_action.yml.mustache
@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest, windows-latest, macos-latest]
-        php-versions: ['7.4', '8.0', '8.1']
+        php-versions: ['8.1']
     runs-on: ${{ matrix.operating-system }}
     steps:
       - name: Checkout
diff --git a/modules/openapi-generator/src/main/resources/php-slim4-server/licenseInfo.mustache b/modules/openapi-generator/src/main/resources/php-slim4-server/licenseInfo.mustache
index 8a61a5402ff4..a2ecb44c36c4 100644
--- a/modules/openapi-generator/src/main/resources/php-slim4-server/licenseInfo.mustache
+++ b/modules/openapi-generator/src/main/resources/php-slim4-server/licenseInfo.mustache
@@ -2,7 +2,7 @@
  {{#appName}}
  * {{{.}}}
  {{/appName}}
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package {{invokerPackage}}
  * @author  OpenAPI Generator team
@@ -20,4 +20,4 @@
  * Contact: {{{.}}}
  {{/infoEmail}}
  * Generated by: https://github.com/openapitools/openapi-generator.git
- */
\ No newline at end of file
+ */
diff --git a/modules/openapi-generator/src/main/resources/php-symfony/composer.mustache b/modules/openapi-generator/src/main/resources/php-symfony/composer.mustache
index 3a061043642a..c51a6854d9be 100644
--- a/modules/openapi-generator/src/main/resources/php-symfony/composer.mustache
+++ b/modules/openapi-generator/src/main/resources/php-symfony/composer.mustache
@@ -24,7 +24,7 @@
         }
     ],
     "require": {
-        "php": ">=8.1",
+        "php": "^8.1",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
diff --git a/modules/openapi-generator/src/main/resources/php/ApiException.mustache b/modules/openapi-generator/src/main/resources/php/ApiException.mustache
index c5c3995dd540..285839e2ded7 100644
--- a/modules/openapi-generator/src/main/resources/php/ApiException.mustache
+++ b/modules/openapi-generator/src/main/resources/php/ApiException.mustache
@@ -1,7 +1,7 @@
 <?php
 /**
  * ApiException
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/Configuration.mustache b/modules/openapi-generator/src/main/resources/php/Configuration.mustache
index 95d0ce2df1fe..5f8159b6a285 100644
--- a/modules/openapi-generator/src/main/resources/php/Configuration.mustache
+++ b/modules/openapi-generator/src/main/resources/php/Configuration.mustache
@@ -1,7 +1,7 @@
 <?php
 /**
  * Configuration
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  {{invokerPackage}}
@@ -20,7 +20,7 @@ namespace {{invokerPackage}};
 
 /**
  * Configuration Class Doc Comment
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/HeaderSelector.mustache b/modules/openapi-generator/src/main/resources/php/HeaderSelector.mustache
index ad2a00ea7c27..1470695d3c23 100644
--- a/modules/openapi-generator/src/main/resources/php/HeaderSelector.mustache
+++ b/modules/openapi-generator/src/main/resources/php/HeaderSelector.mustache
@@ -1,7 +1,7 @@
 <?php
 /**
  * HeaderSelector
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/ModelInterface.mustache b/modules/openapi-generator/src/main/resources/php/ModelInterface.mustache
index 805db43f0dfa..4b0def70a90d 100644
--- a/modules/openapi-generator/src/main/resources/php/ModelInterface.mustache
+++ b/modules/openapi-generator/src/main/resources/php/ModelInterface.mustache
@@ -2,7 +2,7 @@
 /**
  * ModelInterface
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  {{modelPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache b/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
index e25b25ce28d7..c650ac86df5a 100644
--- a/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
+++ b/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
@@ -2,7 +2,7 @@
 /**
  * ObjectSerializer
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/README.mustache b/modules/openapi-generator/src/main/resources/php/README.mustache
index 40478055de45..31148a66a170 100644
--- a/modules/openapi-generator/src/main/resources/php/README.mustache
+++ b/modules/openapi-generator/src/main/resources/php/README.mustache
@@ -12,8 +12,7 @@ For more information, please visit [{{{infoUrl}}}]({{{infoUrl}}}).
 
 ### Requirements
 
-PHP 7.4 and later.
-Should also work with PHP 8.0.
+PHP 8.1 and later.
 
 ### Composer
 
diff --git a/modules/openapi-generator/src/main/resources/php/api.mustache b/modules/openapi-generator/src/main/resources/php/api.mustache
index f6246863be4d..9acfcd42797f 100644
--- a/modules/openapi-generator/src/main/resources/php/api.mustache
+++ b/modules/openapi-generator/src/main/resources/php/api.mustache
@@ -1,7 +1,7 @@
 <?php
 /**
  * {{classname}}
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/api_test.mustache b/modules/openapi-generator/src/main/resources/php/api_test.mustache
index 0fc99231c148..ac29c66fc7d2 100644
--- a/modules/openapi-generator/src/main/resources/php/api_test.mustache
+++ b/modules/openapi-generator/src/main/resources/php/api_test.mustache
@@ -1,7 +1,7 @@
 <?php
 /**
  * {{classname}}Test
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/composer.mustache b/modules/openapi-generator/src/main/resources/php/composer.mustache
index 121ba6a33680..3137dc473dd2 100644
--- a/modules/openapi-generator/src/main/resources/php/composer.mustache
+++ b/modules/openapi-generator/src/main/resources/php/composer.mustache
@@ -24,7 +24,7 @@
         }
     ],
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.1",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
diff --git a/modules/openapi-generator/src/main/resources/php/libraries/psr-18/composer.mustache b/modules/openapi-generator/src/main/resources/php/libraries/psr-18/composer.mustache
index c06fa218e436..c1903bd45d92 100644
--- a/modules/openapi-generator/src/main/resources/php/libraries/psr-18/composer.mustache
+++ b/modules/openapi-generator/src/main/resources/php/libraries/psr-18/composer.mustache
@@ -27,7 +27,7 @@
         "sort-packages": true
     },
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.1",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
diff --git a/modules/openapi-generator/src/main/resources/php/model.mustache b/modules/openapi-generator/src/main/resources/php/model.mustache
index fe57ed7e53a9..b50114126bc7 100644
--- a/modules/openapi-generator/src/main/resources/php/model.mustache
+++ b/modules/openapi-generator/src/main/resources/php/model.mustache
@@ -4,7 +4,7 @@
 /**
  * {{classname}}
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/model_test.mustache b/modules/openapi-generator/src/main/resources/php/model_test.mustache
index f1c46499bc09..6687753453cd 100644
--- a/modules/openapi-generator/src/main/resources/php/model_test.mustache
+++ b/modules/openapi-generator/src/main/resources/php/model_test.mustache
@@ -4,7 +4,7 @@
 /**
  * {{classname}}Test
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/spring/KotlinSpringServerCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/spring/KotlinSpringServerCodegenTest.java
index 8804e7561767..c0c1f9d27c65 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/spring/KotlinSpringServerCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/spring/KotlinSpringServerCodegenTest.java
@@ -845,7 +845,7 @@ public void givenMultipartForm_whenGenerateReactiveServer_thenParameterAreCreate
         Path outputFilepath = Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/PetApiController.kt");
 
         assertFileContains(outputFilepath,
-                "@Parameter(description = \"Additional data to pass to server\") @RequestParam(value = \"additionalMetadata\", required = false) additionalMetadata: kotlin.String?");
+                "@Parameter(description = \"Additional data to pass to server\") @Valid @RequestParam(value = \"additionalMetadata\", required = false) additionalMetadata: kotlin.String?");
         assertFileContains(outputFilepath,
                 "@Parameter(description = \"image to upload\") @Valid @RequestPart(\"image\", required = false) image: org.springframework.web.multipart.MultipartFile");
 
diff --git a/samples/client/petstore/php-dt/README.md b/samples/client/petstore/php-dt/README.md
index 60e00bdc6c5a..eef34228f6c1 100644
--- a/samples/client/petstore/php-dt/README.md
+++ b/samples/client/petstore/php-dt/README.md
@@ -5,7 +5,7 @@ Generated by the [OpenAPI Generator](https://openapi-generator.tech) project.
 ## Overview
 This lightweight extensible client library is [PSR-7](https://www.php-fig.org/psr/psr-7), [PSR-11](https://www.php-fig.org/psr/psr-11), [PSR-17](https://www.php-fig.org/psr/psr-17) and [PSR-18](https://www.php-fig.org/psr/psr-18) complaint and relies on:
 
-- PHP: >=7.4
+- PHP: >=8.1
 - [Data Transfer](https://github.com/Articus/DataTransfer): >=0.6
 
 
diff --git a/samples/client/petstore/php-dt/composer.json b/samples/client/petstore/php-dt/composer.json
index 63ce6fcc64d6..fe01b484dd63 100644
--- a/samples/client/petstore/php-dt/composer.json
+++ b/samples/client/petstore/php-dt/composer.json
@@ -18,7 +18,7 @@
     "version": "1.0.0",
     "type": "library",
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.1",
         "articus/data-transfer": "^0.6",
         "articus/openapi-generator-common": "^0.3",
         "articus/openapi-generator-apiclient": "^0.2",
@@ -36,4 +36,4 @@
         "nyholm/psr7": "^1.8",
         "symfony/http-client": "^5.4"
     }
-}
\ No newline at end of file
+}
diff --git a/samples/client/petstore/php/OpenAPIClient-php/README.md b/samples/client/petstore/php/OpenAPIClient-php/README.md
index d6f67751a753..81f5c4bf3639 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/README.md
+++ b/samples/client/petstore/php/OpenAPIClient-php/README.md
@@ -7,8 +7,7 @@ This spec is mainly for testing Petstore server and contains fake endpoints, mod
 
 ### Requirements
 
-PHP 7.4 and later.
-Should also work with PHP 8.0.
+PHP 8.1 and later.
 
 ### Composer
 
diff --git a/samples/client/petstore/php/OpenAPIClient-php/composer.json b/samples/client/petstore/php/OpenAPIClient-php/composer.json
index fa431b540852..f700934f4012 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/composer.json
+++ b/samples/client/petstore/php/OpenAPIClient-php/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.1",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/AnotherFakeApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/AnotherFakeApi.php
index 4d359a63b348..d97d060f866c 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/AnotherFakeApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/AnotherFakeApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * AnotherFakeApi
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/DefaultApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/DefaultApi.php
index 34354fce4bd3..2a3996d403cb 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/DefaultApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/DefaultApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * DefaultApi
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeApi.php
index a89d506fec6e..f1349de63575 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * FakeApi
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeClassnameTags123Api.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeClassnameTags123Api.php
index 6a1b0f92b79c..d2215d53885d 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeClassnameTags123Api.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeClassnameTags123Api.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * FakeClassnameTags123Api
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/PetApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/PetApi.php
index afc732bd153a..3f3f7049302a 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/PetApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/PetApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * PetApi
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/StoreApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/StoreApi.php
index 22cfae334214..25196cc8e363 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/StoreApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/StoreApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * StoreApi
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/UserApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/UserApi.php
index ece4e248fa5d..580ea06e9c4a 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/UserApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/UserApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * UserApi
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/ApiException.php b/samples/client/petstore/php/OpenAPIClient-php/lib/ApiException.php
index 02a08dd56358..0a46f63b2829 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/ApiException.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/ApiException.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * ApiException
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Configuration.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Configuration.php
index 98176a868f29..5a12a331ea86 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Configuration.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Configuration.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * Configuration
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
@@ -29,7 +29,7 @@
 
 /**
  * Configuration Class Doc Comment
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/HeaderSelector.php b/samples/client/petstore/php/OpenAPIClient-php/lib/HeaderSelector.php
index 6652f7758a72..5f05a3f449b3 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/HeaderSelector.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/HeaderSelector.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * HeaderSelector
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AdditionalPropertiesClass.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AdditionalPropertiesClass.php
index c5d82cf2b9ec..f1563267e8a5 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AdditionalPropertiesClass.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AdditionalPropertiesClass.php
@@ -2,7 +2,7 @@
 /**
  * AdditionalPropertiesClass
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AllOfWithSingleRef.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AllOfWithSingleRef.php
index 0c4fe3f77362..f8e359f166a6 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AllOfWithSingleRef.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AllOfWithSingleRef.php
@@ -2,7 +2,7 @@
 /**
  * AllOfWithSingleRef
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Animal.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Animal.php
index a082517d364b..24cd2eda3866 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Animal.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Animal.php
@@ -2,7 +2,7 @@
 /**
  * Animal
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ApiResponse.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ApiResponse.php
index cd237408a06e..4483f101e353 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ApiResponse.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ApiResponse.php
@@ -2,7 +2,7 @@
 /**
  * ApiResponse
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php
index 2f96209b2ed9..74cfe7c01f60 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php
@@ -2,7 +2,7 @@
 /**
  * ArrayOfArrayOfNumberOnly
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfNumberOnly.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfNumberOnly.php
index c9db3ef4fe4b..6268b3e67dda 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfNumberOnly.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfNumberOnly.php
@@ -2,7 +2,7 @@
 /**
  * ArrayOfNumberOnly
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayTest.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayTest.php
index aa2256732c4e..96df7eaa25d4 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayTest.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayTest.php
@@ -2,7 +2,7 @@
 /**
  * ArrayTest
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Capitalization.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Capitalization.php
index 3967ba9c4c1f..f0861123b4d6 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Capitalization.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Capitalization.php
@@ -2,7 +2,7 @@
 /**
  * Capitalization
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Cat.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Cat.php
index bb40bdd7eb1a..a696eb912aee 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Cat.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Cat.php
@@ -2,7 +2,7 @@
 /**
  * Cat
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Category.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Category.php
index 26a4239132f9..936f07b31aca 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Category.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Category.php
@@ -2,7 +2,7 @@
 /**
  * Category
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ClassModel.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ClassModel.php
index 185db7621576..a5ccae1f17bb 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ClassModel.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ClassModel.php
@@ -2,7 +2,7 @@
 /**
  * ClassModel
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Client.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Client.php
index 4bd491509ad4..f29ed1f53b93 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Client.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Client.php
@@ -2,7 +2,7 @@
 /**
  * Client
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DeprecatedObject.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DeprecatedObject.php
index 71a119931435..33f469a2bde3 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DeprecatedObject.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DeprecatedObject.php
@@ -2,7 +2,7 @@
 /**
  * DeprecatedObject
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Dog.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Dog.php
index 1f7415286c03..36f9f745eb49 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Dog.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Dog.php
@@ -2,7 +2,7 @@
 /**
  * Dog
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumArrays.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumArrays.php
index 31ff8115d939..389afaf8d700 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumArrays.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumArrays.php
@@ -2,7 +2,7 @@
 /**
  * EnumArrays
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumClass.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumClass.php
index 58a3bfa11e50..8600b08ea2c4 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumClass.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumClass.php
@@ -2,7 +2,7 @@
 /**
  * EnumClass
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumTest.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumTest.php
index 0421c2c3a69b..ad3821d5ff22 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumTest.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumTest.php
@@ -2,7 +2,7 @@
 /**
  * EnumTest
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumWithNameAndDescription.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumWithNameAndDescription.php
index 64f28b3ac20d..f64ec6e3fac6 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumWithNameAndDescription.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumWithNameAndDescription.php
@@ -2,7 +2,7 @@
 /**
  * EnumWithNameAndDescription
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FakeBigDecimalMap200Response.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FakeBigDecimalMap200Response.php
index 28d6616c7393..ec97d6b7ed96 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FakeBigDecimalMap200Response.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FakeBigDecimalMap200Response.php
@@ -2,7 +2,7 @@
 /**
  * FakeBigDecimalMap200Response
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/File.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/File.php
index cf458742fa0e..b7c15e5b71ca 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/File.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/File.php
@@ -2,7 +2,7 @@
 /**
  * File
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FileSchemaTestClass.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FileSchemaTestClass.php
index 79473beb3235..e406916498e2 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FileSchemaTestClass.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FileSchemaTestClass.php
@@ -2,7 +2,7 @@
 /**
  * FileSchemaTestClass
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Foo.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Foo.php
index bca2fa7274b4..c41904e9e393 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Foo.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Foo.php
@@ -2,7 +2,7 @@
 /**
  * Foo
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FooGetDefaultResponse.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FooGetDefaultResponse.php
index bc61dbf17c52..10e10cfbbafb 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FooGetDefaultResponse.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FooGetDefaultResponse.php
@@ -2,7 +2,7 @@
 /**
  * FooGetDefaultResponse
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FormatTest.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FormatTest.php
index 3761b92307ba..adcac58e1429 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FormatTest.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FormatTest.php
@@ -2,7 +2,7 @@
 /**
  * FormatTest
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HasOnlyReadOnly.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HasOnlyReadOnly.php
index 781253f5eb61..587cd488e652 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HasOnlyReadOnly.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HasOnlyReadOnly.php
@@ -2,7 +2,7 @@
 /**
  * HasOnlyReadOnly
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HealthCheckResult.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HealthCheckResult.php
index 0535393f9fc5..8299b3e8bc9a 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HealthCheckResult.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HealthCheckResult.php
@@ -2,7 +2,7 @@
 /**
  * HealthCheckResult
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MapTest.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MapTest.php
index be6508e707c2..1cb02be0f022 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MapTest.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MapTest.php
@@ -2,7 +2,7 @@
 /**
  * MapTest
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
index d0c0528a712d..28aed8faac25 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
@@ -2,7 +2,7 @@
 /**
  * MixedPropertiesAndAdditionalPropertiesClass
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Model200Response.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Model200Response.php
index ae13b0951cbf..d481465404dc 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Model200Response.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Model200Response.php
@@ -2,7 +2,7 @@
 /**
  * Model200Response
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelInterface.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelInterface.php
index 081f9b42be23..16584c90def4 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelInterface.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelInterface.php
@@ -2,7 +2,7 @@
 /**
  * ModelInterface
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client\Model
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelList.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelList.php
index b7c368284ee8..46ffd795de44 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelList.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelList.php
@@ -2,7 +2,7 @@
 /**
  * ModelList
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelReturn.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelReturn.php
index b5d125b65bef..b7f8c2692365 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelReturn.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelReturn.php
@@ -2,7 +2,7 @@
 /**
  * ModelReturn
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Name.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Name.php
index d1a0a28933da..3c878ba56ad8 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Name.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Name.php
@@ -2,7 +2,7 @@
 /**
  * Name
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NullableClass.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NullableClass.php
index 3b597c7aa0d7..68f088c2d57f 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NullableClass.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NullableClass.php
@@ -2,7 +2,7 @@
 /**
  * NullableClass
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NumberOnly.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NumberOnly.php
index f9d2df4891f1..933ae3db16fa 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NumberOnly.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NumberOnly.php
@@ -2,7 +2,7 @@
 /**
  * NumberOnly
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ObjectWithDeprecatedFields.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ObjectWithDeprecatedFields.php
index a8d793951ede..4a2003482b69 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ObjectWithDeprecatedFields.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ObjectWithDeprecatedFields.php
@@ -2,7 +2,7 @@
 /**
  * ObjectWithDeprecatedFields
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Order.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Order.php
index feaa2ab84636..0907dcbdb646 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Order.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Order.php
@@ -2,7 +2,7 @@
 /**
  * Order
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterComposite.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterComposite.php
index 197d7f0700b8..760b4308b86e 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterComposite.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterComposite.php
@@ -2,7 +2,7 @@
 /**
  * OuterComposite
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnum.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnum.php
index ac8200b7a6d8..d6f70f620288 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnum.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnum.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnum
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumDefaultValue.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumDefaultValue.php
index 77b337bc7d6b..3d197830d503 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumDefaultValue.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumDefaultValue.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnumDefaultValue
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumInteger.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumInteger.php
index 1254fdb48993..25bab14707a5 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumInteger.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumInteger.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnumInteger
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumIntegerDefaultValue.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumIntegerDefaultValue.php
index efadf43b70e7..dafa45ef95e2 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumIntegerDefaultValue.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumIntegerDefaultValue.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnumIntegerDefaultValue
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterObjectWithEnumProperty.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterObjectWithEnumProperty.php
index b9d1dbf07516..dd40ddd32393 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterObjectWithEnumProperty.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterObjectWithEnumProperty.php
@@ -2,7 +2,7 @@
 /**
  * OuterObjectWithEnumProperty
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Pet.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Pet.php
index 8b6622462823..52700fd420a3 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Pet.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Pet.php
@@ -2,7 +2,7 @@
 /**
  * Pet
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/PropertyNameMapping.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/PropertyNameMapping.php
index 9c688788d561..543c5bad7fb7 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/PropertyNameMapping.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/PropertyNameMapping.php
@@ -2,7 +2,7 @@
 /**
  * PropertyNameMapping
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ReadOnlyFirst.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ReadOnlyFirst.php
index 2b6e9135aa38..87c72d341f34 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ReadOnlyFirst.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ReadOnlyFirst.php
@@ -2,7 +2,7 @@
 /**
  * ReadOnlyFirst
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SingleRefType.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SingleRefType.php
index 33f966af1fb1..d208d59cd883 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SingleRefType.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SingleRefType.php
@@ -2,7 +2,7 @@
 /**
  * SingleRefType
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SpecialModelName.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SpecialModelName.php
index 6b6f4cf640b9..8d353a5c269d 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SpecialModelName.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SpecialModelName.php
@@ -2,7 +2,7 @@
 /**
  * SpecialModelName
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Tag.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Tag.php
index bda60d16d95b..734420290012 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Tag.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Tag.php
@@ -2,7 +2,7 @@
 /**
  * Tag
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/TestInlineFreeformAdditionalPropertiesRequest.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/TestInlineFreeformAdditionalPropertiesRequest.php
index 2c5ddf95db86..3c409cafc04f 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/TestInlineFreeformAdditionalPropertiesRequest.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/TestInlineFreeformAdditionalPropertiesRequest.php
@@ -2,7 +2,7 @@
 /**
  * TestInlineFreeformAdditionalPropertiesRequest
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/User.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/User.php
index 43eb9a7810c4..f3fa2d8d5ebf 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/User.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/User.php
@@ -2,7 +2,7 @@
 /**
  * User
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php b/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
index 3e1cbe8778bc..d6d1fa941d6c 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
@@ -2,7 +2,7 @@
 /**
  * ObjectSerializer
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/composer.json b/samples/client/petstore/php/psr-18/composer.json
index d0360d4f9b86..c25a5002ef38 100644
--- a/samples/client/petstore/php/psr-18/composer.json
+++ b/samples/client/petstore/php/psr-18/composer.json
@@ -21,7 +21,7 @@
         "sort-packages": true
     },
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.1",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
diff --git a/samples/client/petstore/php/psr-18/composer.lock b/samples/client/petstore/php/psr-18/composer.lock
index c1cf6707bf57..cd49ec11113a 100644
--- a/samples/client/petstore/php/psr-18/composer.lock
+++ b/samples/client/petstore/php/psr-18/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "eaa4af6876416b9e7ba17683702be606",
+    "content-hash": "009d7a0d82a4fb312013b81667ee90b6",
     "packages": [
         {
             "name": "clue/stream-filter",
@@ -4973,11 +4973,11 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.2",
+        "php": "^8.1",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*"
     },
     "platform-dev": [],
-    "plugin-api-version": "2.2.0"
+    "plugin-api-version": "2.6.0"
 }
diff --git a/samples/client/petstore/php/psr-18/lib/Configuration.php b/samples/client/petstore/php/psr-18/lib/Configuration.php
index 98176a868f29..5a12a331ea86 100644
--- a/samples/client/petstore/php/psr-18/lib/Configuration.php
+++ b/samples/client/petstore/php/psr-18/lib/Configuration.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * Configuration
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
@@ -29,7 +29,7 @@
 
 /**
  * Configuration Class Doc Comment
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/HeaderSelector.php b/samples/client/petstore/php/psr-18/lib/HeaderSelector.php
index 6652f7758a72..5f05a3f449b3 100644
--- a/samples/client/petstore/php/psr-18/lib/HeaderSelector.php
+++ b/samples/client/petstore/php/psr-18/lib/HeaderSelector.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * HeaderSelector
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/AdditionalPropertiesClass.php b/samples/client/petstore/php/psr-18/lib/Model/AdditionalPropertiesClass.php
index c5d82cf2b9ec..f1563267e8a5 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/AdditionalPropertiesClass.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/AdditionalPropertiesClass.php
@@ -2,7 +2,7 @@
 /**
  * AdditionalPropertiesClass
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/AllOfWithSingleRef.php b/samples/client/petstore/php/psr-18/lib/Model/AllOfWithSingleRef.php
index 0c4fe3f77362..f8e359f166a6 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/AllOfWithSingleRef.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/AllOfWithSingleRef.php
@@ -2,7 +2,7 @@
 /**
  * AllOfWithSingleRef
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Animal.php b/samples/client/petstore/php/psr-18/lib/Model/Animal.php
index a082517d364b..24cd2eda3866 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Animal.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Animal.php
@@ -2,7 +2,7 @@
 /**
  * Animal
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/ApiResponse.php b/samples/client/petstore/php/psr-18/lib/Model/ApiResponse.php
index cd237408a06e..4483f101e353 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/ApiResponse.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/ApiResponse.php
@@ -2,7 +2,7 @@
 /**
  * ApiResponse
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/ArrayOfArrayOfNumberOnly.php b/samples/client/petstore/php/psr-18/lib/Model/ArrayOfArrayOfNumberOnly.php
index 2f96209b2ed9..74cfe7c01f60 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/ArrayOfArrayOfNumberOnly.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/ArrayOfArrayOfNumberOnly.php
@@ -2,7 +2,7 @@
 /**
  * ArrayOfArrayOfNumberOnly
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/ArrayOfNumberOnly.php b/samples/client/petstore/php/psr-18/lib/Model/ArrayOfNumberOnly.php
index c9db3ef4fe4b..6268b3e67dda 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/ArrayOfNumberOnly.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/ArrayOfNumberOnly.php
@@ -2,7 +2,7 @@
 /**
  * ArrayOfNumberOnly
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/ArrayTest.php b/samples/client/petstore/php/psr-18/lib/Model/ArrayTest.php
index aa2256732c4e..96df7eaa25d4 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/ArrayTest.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/ArrayTest.php
@@ -2,7 +2,7 @@
 /**
  * ArrayTest
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Capitalization.php b/samples/client/petstore/php/psr-18/lib/Model/Capitalization.php
index 3967ba9c4c1f..f0861123b4d6 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Capitalization.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Capitalization.php
@@ -2,7 +2,7 @@
 /**
  * Capitalization
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Cat.php b/samples/client/petstore/php/psr-18/lib/Model/Cat.php
index bb40bdd7eb1a..a696eb912aee 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Cat.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Cat.php
@@ -2,7 +2,7 @@
 /**
  * Cat
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Category.php b/samples/client/petstore/php/psr-18/lib/Model/Category.php
index 26a4239132f9..936f07b31aca 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Category.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Category.php
@@ -2,7 +2,7 @@
 /**
  * Category
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/ClassModel.php b/samples/client/petstore/php/psr-18/lib/Model/ClassModel.php
index 185db7621576..a5ccae1f17bb 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/ClassModel.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/ClassModel.php
@@ -2,7 +2,7 @@
 /**
  * ClassModel
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Client.php b/samples/client/petstore/php/psr-18/lib/Model/Client.php
index 4bd491509ad4..f29ed1f53b93 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Client.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Client.php
@@ -2,7 +2,7 @@
 /**
  * Client
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/DeprecatedObject.php b/samples/client/petstore/php/psr-18/lib/Model/DeprecatedObject.php
index 71a119931435..33f469a2bde3 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/DeprecatedObject.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/DeprecatedObject.php
@@ -2,7 +2,7 @@
 /**
  * DeprecatedObject
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Dog.php b/samples/client/petstore/php/psr-18/lib/Model/Dog.php
index 1f7415286c03..36f9f745eb49 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Dog.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Dog.php
@@ -2,7 +2,7 @@
 /**
  * Dog
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/EnumArrays.php b/samples/client/petstore/php/psr-18/lib/Model/EnumArrays.php
index 31ff8115d939..389afaf8d700 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/EnumArrays.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/EnumArrays.php
@@ -2,7 +2,7 @@
 /**
  * EnumArrays
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/EnumClass.php b/samples/client/petstore/php/psr-18/lib/Model/EnumClass.php
index 58a3bfa11e50..8600b08ea2c4 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/EnumClass.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/EnumClass.php
@@ -2,7 +2,7 @@
 /**
  * EnumClass
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/EnumTest.php b/samples/client/petstore/php/psr-18/lib/Model/EnumTest.php
index 0421c2c3a69b..ad3821d5ff22 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/EnumTest.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/EnumTest.php
@@ -2,7 +2,7 @@
 /**
  * EnumTest
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/EnumWithNameAndDescription.php b/samples/client/petstore/php/psr-18/lib/Model/EnumWithNameAndDescription.php
index 64f28b3ac20d..f64ec6e3fac6 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/EnumWithNameAndDescription.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/EnumWithNameAndDescription.php
@@ -2,7 +2,7 @@
 /**
  * EnumWithNameAndDescription
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/FakeBigDecimalMap200Response.php b/samples/client/petstore/php/psr-18/lib/Model/FakeBigDecimalMap200Response.php
index 28d6616c7393..ec97d6b7ed96 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/FakeBigDecimalMap200Response.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/FakeBigDecimalMap200Response.php
@@ -2,7 +2,7 @@
 /**
  * FakeBigDecimalMap200Response
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/File.php b/samples/client/petstore/php/psr-18/lib/Model/File.php
index cf458742fa0e..b7c15e5b71ca 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/File.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/File.php
@@ -2,7 +2,7 @@
 /**
  * File
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/FileSchemaTestClass.php b/samples/client/petstore/php/psr-18/lib/Model/FileSchemaTestClass.php
index 79473beb3235..e406916498e2 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/FileSchemaTestClass.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/FileSchemaTestClass.php
@@ -2,7 +2,7 @@
 /**
  * FileSchemaTestClass
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Foo.php b/samples/client/petstore/php/psr-18/lib/Model/Foo.php
index bca2fa7274b4..c41904e9e393 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Foo.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Foo.php
@@ -2,7 +2,7 @@
 /**
  * Foo
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/FooGetDefaultResponse.php b/samples/client/petstore/php/psr-18/lib/Model/FooGetDefaultResponse.php
index bc61dbf17c52..10e10cfbbafb 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/FooGetDefaultResponse.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/FooGetDefaultResponse.php
@@ -2,7 +2,7 @@
 /**
  * FooGetDefaultResponse
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/FormatTest.php b/samples/client/petstore/php/psr-18/lib/Model/FormatTest.php
index 3761b92307ba..adcac58e1429 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/FormatTest.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/FormatTest.php
@@ -2,7 +2,7 @@
 /**
  * FormatTest
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/HasOnlyReadOnly.php b/samples/client/petstore/php/psr-18/lib/Model/HasOnlyReadOnly.php
index 781253f5eb61..587cd488e652 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/HasOnlyReadOnly.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/HasOnlyReadOnly.php
@@ -2,7 +2,7 @@
 /**
  * HasOnlyReadOnly
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/HealthCheckResult.php b/samples/client/petstore/php/psr-18/lib/Model/HealthCheckResult.php
index 0535393f9fc5..8299b3e8bc9a 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/HealthCheckResult.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/HealthCheckResult.php
@@ -2,7 +2,7 @@
 /**
  * HealthCheckResult
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/MapTest.php b/samples/client/petstore/php/psr-18/lib/Model/MapTest.php
index be6508e707c2..1cb02be0f022 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/MapTest.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/MapTest.php
@@ -2,7 +2,7 @@
 /**
  * MapTest
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php b/samples/client/petstore/php/psr-18/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
index d0c0528a712d..28aed8faac25 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
@@ -2,7 +2,7 @@
 /**
  * MixedPropertiesAndAdditionalPropertiesClass
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Model200Response.php b/samples/client/petstore/php/psr-18/lib/Model/Model200Response.php
index ae13b0951cbf..d481465404dc 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Model200Response.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Model200Response.php
@@ -2,7 +2,7 @@
 /**
  * Model200Response
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/ModelInterface.php b/samples/client/petstore/php/psr-18/lib/Model/ModelInterface.php
index 081f9b42be23..16584c90def4 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/ModelInterface.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/ModelInterface.php
@@ -2,7 +2,7 @@
 /**
  * ModelInterface
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client\Model
diff --git a/samples/client/petstore/php/psr-18/lib/Model/ModelList.php b/samples/client/petstore/php/psr-18/lib/Model/ModelList.php
index b7c368284ee8..46ffd795de44 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/ModelList.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/ModelList.php
@@ -2,7 +2,7 @@
 /**
  * ModelList
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/ModelReturn.php b/samples/client/petstore/php/psr-18/lib/Model/ModelReturn.php
index b5d125b65bef..b7f8c2692365 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/ModelReturn.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/ModelReturn.php
@@ -2,7 +2,7 @@
 /**
  * ModelReturn
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Name.php b/samples/client/petstore/php/psr-18/lib/Model/Name.php
index d1a0a28933da..3c878ba56ad8 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Name.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Name.php
@@ -2,7 +2,7 @@
 /**
  * Name
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/NullableClass.php b/samples/client/petstore/php/psr-18/lib/Model/NullableClass.php
index 3b597c7aa0d7..68f088c2d57f 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/NullableClass.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/NullableClass.php
@@ -2,7 +2,7 @@
 /**
  * NullableClass
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/NumberOnly.php b/samples/client/petstore/php/psr-18/lib/Model/NumberOnly.php
index f9d2df4891f1..933ae3db16fa 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/NumberOnly.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/NumberOnly.php
@@ -2,7 +2,7 @@
 /**
  * NumberOnly
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/ObjectWithDeprecatedFields.php b/samples/client/petstore/php/psr-18/lib/Model/ObjectWithDeprecatedFields.php
index a8d793951ede..4a2003482b69 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/ObjectWithDeprecatedFields.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/ObjectWithDeprecatedFields.php
@@ -2,7 +2,7 @@
 /**
  * ObjectWithDeprecatedFields
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Order.php b/samples/client/petstore/php/psr-18/lib/Model/Order.php
index feaa2ab84636..0907dcbdb646 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Order.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Order.php
@@ -2,7 +2,7 @@
 /**
  * Order
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/OuterComposite.php b/samples/client/petstore/php/psr-18/lib/Model/OuterComposite.php
index 197d7f0700b8..760b4308b86e 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/OuterComposite.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/OuterComposite.php
@@ -2,7 +2,7 @@
 /**
  * OuterComposite
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/OuterEnum.php b/samples/client/petstore/php/psr-18/lib/Model/OuterEnum.php
index ac8200b7a6d8..d6f70f620288 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/OuterEnum.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/OuterEnum.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnum
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/OuterEnumDefaultValue.php b/samples/client/petstore/php/psr-18/lib/Model/OuterEnumDefaultValue.php
index 77b337bc7d6b..3d197830d503 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/OuterEnumDefaultValue.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/OuterEnumDefaultValue.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnumDefaultValue
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/OuterEnumInteger.php b/samples/client/petstore/php/psr-18/lib/Model/OuterEnumInteger.php
index 1254fdb48993..25bab14707a5 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/OuterEnumInteger.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/OuterEnumInteger.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnumInteger
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/OuterEnumIntegerDefaultValue.php b/samples/client/petstore/php/psr-18/lib/Model/OuterEnumIntegerDefaultValue.php
index efadf43b70e7..dafa45ef95e2 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/OuterEnumIntegerDefaultValue.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/OuterEnumIntegerDefaultValue.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnumIntegerDefaultValue
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/OuterObjectWithEnumProperty.php b/samples/client/petstore/php/psr-18/lib/Model/OuterObjectWithEnumProperty.php
index b9d1dbf07516..dd40ddd32393 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/OuterObjectWithEnumProperty.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/OuterObjectWithEnumProperty.php
@@ -2,7 +2,7 @@
 /**
  * OuterObjectWithEnumProperty
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Pet.php b/samples/client/petstore/php/psr-18/lib/Model/Pet.php
index 8b6622462823..52700fd420a3 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Pet.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Pet.php
@@ -2,7 +2,7 @@
 /**
  * Pet
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/PropertyNameMapping.php b/samples/client/petstore/php/psr-18/lib/Model/PropertyNameMapping.php
index 9c688788d561..543c5bad7fb7 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/PropertyNameMapping.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/PropertyNameMapping.php
@@ -2,7 +2,7 @@
 /**
  * PropertyNameMapping
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/ReadOnlyFirst.php b/samples/client/petstore/php/psr-18/lib/Model/ReadOnlyFirst.php
index 2b6e9135aa38..87c72d341f34 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/ReadOnlyFirst.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/ReadOnlyFirst.php
@@ -2,7 +2,7 @@
 /**
  * ReadOnlyFirst
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/SingleRefType.php b/samples/client/petstore/php/psr-18/lib/Model/SingleRefType.php
index 33f966af1fb1..d208d59cd883 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/SingleRefType.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/SingleRefType.php
@@ -2,7 +2,7 @@
 /**
  * SingleRefType
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/SpecialModelName.php b/samples/client/petstore/php/psr-18/lib/Model/SpecialModelName.php
index 6b6f4cf640b9..8d353a5c269d 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/SpecialModelName.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/SpecialModelName.php
@@ -2,7 +2,7 @@
 /**
  * SpecialModelName
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/Tag.php b/samples/client/petstore/php/psr-18/lib/Model/Tag.php
index bda60d16d95b..734420290012 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/Tag.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/Tag.php
@@ -2,7 +2,7 @@
 /**
  * Tag
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/TestInlineFreeformAdditionalPropertiesRequest.php b/samples/client/petstore/php/psr-18/lib/Model/TestInlineFreeformAdditionalPropertiesRequest.php
index 2c5ddf95db86..3c409cafc04f 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/TestInlineFreeformAdditionalPropertiesRequest.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/TestInlineFreeformAdditionalPropertiesRequest.php
@@ -2,7 +2,7 @@
 /**
  * TestInlineFreeformAdditionalPropertiesRequest
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/Model/User.php b/samples/client/petstore/php/psr-18/lib/Model/User.php
index 43eb9a7810c4..f3fa2d8d5ebf 100644
--- a/samples/client/petstore/php/psr-18/lib/Model/User.php
+++ b/samples/client/petstore/php/psr-18/lib/Model/User.php
@@ -2,7 +2,7 @@
 /**
  * User
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php b/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php
index 3e1cbe8778bc..d6d1fa941d6c 100644
--- a/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php
+++ b/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php
@@ -2,7 +2,7 @@
 /**
  * ObjectSerializer
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/openapi3/server/petstore/php-symfony/SymfonyBundle-php/composer.json b/samples/openapi3/server/petstore/php-symfony/SymfonyBundle-php/composer.json
index 49ef4d4a131e..4a06829cc882 100644
--- a/samples/openapi3/server/petstore/php-symfony/SymfonyBundle-php/composer.json
+++ b/samples/openapi3/server/petstore/php-symfony/SymfonyBundle-php/composer.json
@@ -1,5 +1,5 @@
 {
-    "name": "GIT_USER_ID/GIT_REPO_ID",
+    "name": "git_user_id/git_repo_id",
     "description": "",
     "keywords": [
         "openapi",
diff --git a/samples/server/petstore/kotlin-spring-cloud/src/main/kotlin/org/openapitools/api/PetApi.kt b/samples/server/petstore/kotlin-spring-cloud/src/main/kotlin/org/openapitools/api/PetApi.kt
index 9a637671c4f3..f7a659bedc41 100644
--- a/samples/server/petstore/kotlin-spring-cloud/src/main/kotlin/org/openapitools/api/PetApi.kt
+++ b/samples/server/petstore/kotlin-spring-cloud/src/main/kotlin/org/openapitools/api/PetApi.kt
@@ -99,7 +99,7 @@ interface PetApi {
             value = ["/pet/{petId}"],
             consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "name", required = false) name: kotlin.String? , @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "name", required = false) name: kotlin.String? , @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 
@@ -110,7 +110,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }
diff --git a/samples/server/petstore/kotlin-spring-default/src/main/kotlin/org/openapitools/api/PetApiController.kt b/samples/server/petstore/kotlin-spring-default/src/main/kotlin/org/openapitools/api/PetApiController.kt
index fc44c9d500ab..3e4240107253 100644
--- a/samples/server/petstore/kotlin-spring-default/src/main/kotlin/org/openapitools/api/PetApiController.kt
+++ b/samples/server/petstore/kotlin-spring-default/src/main/kotlin/org/openapitools/api/PetApiController.kt
@@ -158,7 +158,7 @@ class PetApiController() {
         value = ["/pet/{petId}"],
         consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 
@@ -176,7 +176,7 @@ class PetApiController() {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-3/src/main/kotlin/org/openapitools/api/PetApiController.kt b/samples/server/petstore/kotlin-springboot-3/src/main/kotlin/org/openapitools/api/PetApiController.kt
index 41c0da8045e0..cd920cd5bcda 100644
--- a/samples/server/petstore/kotlin-springboot-3/src/main/kotlin/org/openapitools/api/PetApiController.kt
+++ b/samples/server/petstore/kotlin-springboot-3/src/main/kotlin/org/openapitools/api/PetApiController.kt
@@ -95,7 +95,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         value = ["/pet/{petId}"],
         consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "name", required = false) name: kotlin.String? , @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "name", required = false) name: kotlin.String? , @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(service.updatePetWithForm(petId, name, status), HttpStatus.valueOf(405))
     }
 
@@ -106,7 +106,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-delegate-nodefaults/src/main/kotlin/org/openapitools/api/PetApi.kt b/samples/server/petstore/kotlin-springboot-delegate-nodefaults/src/main/kotlin/org/openapitools/api/PetApi.kt
index 737cdc1cad7d..42eeb425c721 100644
--- a/samples/server/petstore/kotlin-springboot-delegate-nodefaults/src/main/kotlin/org/openapitools/api/PetApi.kt
+++ b/samples/server/petstore/kotlin-springboot-delegate-nodefaults/src/main/kotlin/org/openapitools/api/PetApi.kt
@@ -179,7 +179,7 @@ interface PetApi {
             value = ["/pet/{petId}"],
             consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return getDelegate().updatePetWithForm(petId, name, status)
     }
 
@@ -199,7 +199,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return getDelegate().uploadFile(petId, additionalMetadata, file)
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/PetApi.kt b/samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/PetApi.kt
index 6992ef95f2a5..77e2be706299 100644
--- a/samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/PetApi.kt
+++ b/samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/PetApi.kt
@@ -178,7 +178,7 @@ interface PetApi {
             value = ["/pet/{petId}"],
             consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return getDelegate().updatePetWithForm(petId, name, status)
     }
 
@@ -198,7 +198,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return getDelegate().uploadFile(petId, additionalMetadata, file)
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/api/PetApiController.kt b/samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/api/PetApiController.kt
index ad45a6ad8be2..84c4333e8944 100644
--- a/samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/api/PetApiController.kt
+++ b/samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/api/PetApiController.kt
@@ -154,7 +154,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         value = ["/pet/{petId}"],
         consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(service.updatePetWithForm(petId, name, status), HttpStatus.valueOf(405))
     }
 
@@ -172,7 +172,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/MultipartMixedApiController.kt b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/MultipartMixedApiController.kt
index f9a8789ef3d0..2934906f7d74 100644
--- a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/MultipartMixedApiController.kt
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/MultipartMixedApiController.kt
@@ -46,7 +46,7 @@ class MultipartMixedApiController() {
         value = ["/multipart-mixed"],
         consumes = ["multipart/form-data"]
     )
-    fun multipartMixed(@Parameter(description = "", required = true, schema = Schema(allowableValues = ["ALLOWED", "IN_PROGRESS", "REJECTED"])) @RequestParam(value = "status", required = true) status: MultipartMixedStatus ,@Parameter(description = "a file") @Valid @RequestPart("file", required = true) file: org.springframework.web.multipart.MultipartFile,@Parameter(description = "") @RequestPart(value = "marker", required = false) marker: MultipartMixedRequestMarker? ): ResponseEntity<Unit> {
+    fun multipartMixed(@Parameter(description = "", required = true, schema = Schema(allowableValues = ["ALLOWED", "IN_PROGRESS", "REJECTED"])) @Valid @RequestParam(value = "status", required = true) status: MultipartMixedStatus ,@Parameter(description = "a file") @Valid @RequestPart("file", required = true) file: org.springframework.web.multipart.MultipartFile,@Parameter(description = "") @Valid @RequestPart(value = "marker", required = false) marker: MultipartMixedRequestMarker? ): ResponseEntity<Unit> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-reactive-without-flow/src/main/kotlin/org/openapitools/api/PetApiController.kt b/samples/server/petstore/kotlin-springboot-reactive-without-flow/src/main/kotlin/org/openapitools/api/PetApiController.kt
index 1394293cc69a..05575e31959f 100644
--- a/samples/server/petstore/kotlin-springboot-reactive-without-flow/src/main/kotlin/org/openapitools/api/PetApiController.kt
+++ b/samples/server/petstore/kotlin-springboot-reactive-without-flow/src/main/kotlin/org/openapitools/api/PetApiController.kt
@@ -159,7 +159,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         value = ["/pet/{petId}"],
         consumes = ["application/x-www-form-urlencoded"]
     )
-    suspend fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    suspend fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(service.updatePetWithForm(petId, name, status), HttpStatus.valueOf(405))
     }
 
@@ -177,7 +177,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    suspend fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    suspend fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/api/PetApiController.kt b/samples/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/api/PetApiController.kt
index a2263f9ac22c..3a9a2760dd62 100644
--- a/samples/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/api/PetApiController.kt
+++ b/samples/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/api/PetApiController.kt
@@ -159,7 +159,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         value = ["/pet/{petId}"],
         consumes = ["application/x-www-form-urlencoded"]
     )
-    suspend fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    suspend fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(service.updatePetWithForm(petId, name, status), HttpStatus.valueOf(405))
     }
 
@@ -177,7 +177,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    suspend fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    suspend fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-request-cookie/src/main/kotlin/org/openapitools/api/PetApi.kt b/samples/server/petstore/kotlin-springboot-request-cookie/src/main/kotlin/org/openapitools/api/PetApi.kt
index a234cc63049a..1268f6c73dcc 100644
--- a/samples/server/petstore/kotlin-springboot-request-cookie/src/main/kotlin/org/openapitools/api/PetApi.kt
+++ b/samples/server/petstore/kotlin-springboot-request-cookie/src/main/kotlin/org/openapitools/api/PetApi.kt
@@ -176,7 +176,7 @@ interface PetApi {
             value = ["/pet/{petId}"],
             consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 
@@ -196,7 +196,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-source-swagger1/src/main/kotlin/org/openapitools/api/PetApiController.kt b/samples/server/petstore/kotlin-springboot-source-swagger1/src/main/kotlin/org/openapitools/api/PetApiController.kt
index c8dcb731d8ac..89a04feba590 100644
--- a/samples/server/petstore/kotlin-springboot-source-swagger1/src/main/kotlin/org/openapitools/api/PetApiController.kt
+++ b/samples/server/petstore/kotlin-springboot-source-swagger1/src/main/kotlin/org/openapitools/api/PetApiController.kt
@@ -156,7 +156,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         value = ["/pet/{petId}"],
         consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm(@ApiParam(value = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Updated name of the pet") @RequestParam(value = "name", required = false) name: kotlin.String? ,@ApiParam(value = "Updated status of the pet") @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm(@ApiParam(value = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) name: kotlin.String? ,@ApiParam(value = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(service.updatePetWithForm(petId, name, status), HttpStatus.valueOf(405))
     }
 
@@ -175,7 +175,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-source-swagger2/src/main/kotlin/org/openapitools/api/PetApiController.kt b/samples/server/petstore/kotlin-springboot-source-swagger2/src/main/kotlin/org/openapitools/api/PetApiController.kt
index ad45a6ad8be2..84c4333e8944 100644
--- a/samples/server/petstore/kotlin-springboot-source-swagger2/src/main/kotlin/org/openapitools/api/PetApiController.kt
+++ b/samples/server/petstore/kotlin-springboot-source-swagger2/src/main/kotlin/org/openapitools/api/PetApiController.kt
@@ -154,7 +154,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         value = ["/pet/{petId}"],
         consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm(@Parameter(description = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) name: kotlin.String? ,@Parameter(description = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(service.updatePetWithForm(petId, name, status), HttpStatus.valueOf(405))
     }
 
@@ -172,7 +172,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/api/PetApiController.kt b/samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/api/PetApiController.kt
index c8dcb731d8ac..89a04feba590 100644
--- a/samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/api/PetApiController.kt
+++ b/samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/api/PetApiController.kt
@@ -156,7 +156,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         value = ["/pet/{petId}"],
         consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm(@ApiParam(value = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Updated name of the pet") @RequestParam(value = "name", required = false) name: kotlin.String? ,@ApiParam(value = "Updated status of the pet") @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm(@ApiParam(value = "ID of pet that needs to be updated", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) name: kotlin.String? ,@ApiParam(value = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(service.updatePetWithForm(petId, name, status), HttpStatus.valueOf(405))
     }
 
@@ -175,7 +175,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }
diff --git a/samples/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/api/PetApiController.kt b/samples/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/api/PetApiController.kt
index ee8089e3b344..4e393ceef9b1 100644
--- a/samples/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/api/PetApiController.kt
+++ b/samples/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/api/PetApiController.kt
@@ -94,7 +94,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         value = ["/pet/{petId}"],
         consumes = ["application/x-www-form-urlencoded"]
     )
-    fun updatePetWithForm( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "name", required = false) name: kotlin.String? , @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
+    fun updatePetWithForm( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "name", required = false) name: kotlin.String? , @Valid @RequestParam(value = "status", required = false) status: kotlin.String? ): ResponseEntity<Unit> {
         return ResponseEntity(service.updatePetWithForm(petId, name, status), HttpStatus.valueOf(405))
     }
 
@@ -105,7 +105,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }
diff --git a/samples/server/petstore/php-flight/composer.json b/samples/server/petstore/php-flight/composer.json
index 782987a751a2..ea307467bc9a 100644
--- a/samples/server/petstore/php-flight/composer.json
+++ b/samples/server/petstore/php-flight/composer.json
@@ -12,7 +12,7 @@
   ],
   "type": "library",
   "require": {
-    "php": "^8.1.0",
+    "php": "^8.1",
     "flightphp/core": "^3.5.1",
     "ext-json": "*"
   },
diff --git a/samples/server/petstore/php-laravel/composer.json b/samples/server/petstore/php-laravel/composer.json
index d69644f94ed1..6b230b67e52b 100644
--- a/samples/server/petstore/php-laravel/composer.json
+++ b/samples/server/petstore/php-laravel/composer.json
@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": ">=8.1",
+        "php": "^8.1",
         "laravel/framework": "^10.0",
         "crell/serde": "^1.0"
     },
diff --git a/samples/server/petstore/php-lumen/lib/composer.json b/samples/server/petstore/php-lumen/lib/composer.json
index 4ef01d3f3ce7..646b22352709 100644
--- a/samples/server/petstore/php-lumen/lib/composer.json
+++ b/samples/server/petstore/php-lumen/lib/composer.json
@@ -21,7 +21,7 @@
     ],
     "type": "project",
     "require": {
-        "php": "^7.2.5",
+        "php": "^8.1",
         "laravel/lumen-framework": "^7.2"
     },
     "require-dev": {
diff --git a/samples/server/petstore/php-mezzio-ph-modern/README.md b/samples/server/petstore/php-mezzio-ph-modern/README.md
index fd66369b261a..ea26b0bac4a7 100644
--- a/samples/server/petstore/php-mezzio-ph-modern/README.md
+++ b/samples/server/petstore/php-mezzio-ph-modern/README.md
@@ -5,7 +5,7 @@ Generated by the [OpenAPI Generator](https://openapi-generator.tech) project.
 ## Overview
 This server stub aims to provide light, yet comprehensive structure for your API project using:
 
-- PHP: >=8.0
+- PHP: >=8.1
 - [Laminas Mezzio](https://docs.mezzio.dev/mezzio/): >=3.3
 - [Path Handler](https://github.com/Articus/PathHandler): >=0.7
 
diff --git a/samples/server/petstore/php-mezzio-ph-modern/composer.json b/samples/server/petstore/php-mezzio-ph-modern/composer.json
index c40d77b6e182..56f655eda679 100644
--- a/samples/server/petstore/php-mezzio-ph-modern/composer.json
+++ b/samples/server/petstore/php-mezzio-ph-modern/composer.json
@@ -18,7 +18,7 @@
     "version": "1.0.0",
     "type": "project",
     "require": {
-        "php": "^8.0",
+        "php": "^8.1",
         "ext-yaml": "^2.2",
         "mezzio/mezzio": "^3.3",
         "laminas/laminas-diactoros": "^2.5",
@@ -36,4 +36,4 @@
             "": "src/"
         }
     }
-}
\ No newline at end of file
+}
diff --git a/samples/server/petstore/php-mezzio-ph/README.md b/samples/server/petstore/php-mezzio-ph/README.md
index a80470059016..d0fb8aebf1f7 100644
--- a/samples/server/petstore/php-mezzio-ph/README.md
+++ b/samples/server/petstore/php-mezzio-ph/README.md
@@ -5,7 +5,7 @@ Generated by the [OpenAPI Generator](https://openapi-generator.tech) project.
 ## Overview
 This server stub aims to provide light, yet comprehensive structure for your API project using:
 
-- PHP: >=7.3
+- PHP: >=8.1
 - [Laminas Mezzio](https://docs.mezzio.dev/mezzio/): >=3.2
 - [Path Handler](https://github.com/Articus/PathHandler): >=0.7
 
diff --git a/samples/server/petstore/php-mezzio-ph/composer.json b/samples/server/petstore/php-mezzio-ph/composer.json
index d335e88d2605..66a930db32f2 100644
--- a/samples/server/petstore/php-mezzio-ph/composer.json
+++ b/samples/server/petstore/php-mezzio-ph/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "php": "^7.3 || ^8.0",
+        "php": "^8.1",
         "ext-yaml": "^2.0",
         "mezzio/mezzio": "^3.2",
         "laminas/laminas-diactoros": "^2.1",
@@ -37,4 +37,4 @@
             "": "src/"
         }
     }
-}
\ No newline at end of file
+}
diff --git a/samples/server/petstore/php-slim4/.github/workflows/main.yml b/samples/server/petstore/php-slim4/.github/workflows/main.yml
index feda9a5f8f79..92860737863b 100644
--- a/samples/server/petstore/php-slim4/.github/workflows/main.yml
+++ b/samples/server/petstore/php-slim4/.github/workflows/main.yml
@@ -6,7 +6,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest, windows-latest, macos-latest]
-        php-versions: ['7.4', '8.0', '8.1']
+        php-versions: ['8.1']
     runs-on: ${{ matrix.operating-system }}
     steps:
       - name: Checkout
diff --git a/samples/server/petstore/php-slim4/README.md b/samples/server/petstore/php-slim4/README.md
index f1d568cc7572..08938e454b63 100644
--- a/samples/server/petstore/php-slim4/README.md
+++ b/samples/server/petstore/php-slim4/README.md
@@ -9,7 +9,7 @@ This server has been generated with [Slim PSR-7](https://github.com/slimphp/Slim
 ## Requirements
 
 * Web server with URL rewriting
-* PHP 7.4 or newer
+* PHP 8.1 or newer
 
 This package contains `.htaccess` for Apache configuration.
 If you use another server(Nginx, HHVM, IIS, lighttpd) check out [Web Servers](https://www.slimframework.com/docs/v3/start/web-servers.html) doc.
diff --git a/samples/server/petstore/php-slim4/composer.json b/samples/server/petstore/php-slim4/composer.json
index 2cd44b3ef38b..12f606802713 100644
--- a/samples/server/petstore/php-slim4/composer.json
+++ b/samples/server/petstore/php-slim4/composer.json
@@ -22,7 +22,7 @@
     }
   ],
   "require": {
-    "php": "^7.4 || ^8.0",
+    "php": "^8.1",
     "dyorg/slim-token-authentication": "dev-slim4",
     "monolog/monolog": "^2.4",
     "neomerx/cors-psr7": "^2.0",
diff --git a/samples/server/petstore/php-slim4/lib/Api/AbstractPetApi.php b/samples/server/petstore/php-slim4/lib/Api/AbstractPetApi.php
index f7d620141c56..4aa9e5b6b7e3 100644
--- a/samples/server/petstore/php-slim4/lib/Api/AbstractPetApi.php
+++ b/samples/server/petstore/php-slim4/lib/Api/AbstractPetApi.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/lib/Api/AbstractStoreApi.php b/samples/server/petstore/php-slim4/lib/Api/AbstractStoreApi.php
index 2bac5b6b2ba1..093a41836f84 100644
--- a/samples/server/petstore/php-slim4/lib/Api/AbstractStoreApi.php
+++ b/samples/server/petstore/php-slim4/lib/Api/AbstractStoreApi.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/lib/Api/AbstractUserApi.php b/samples/server/petstore/php-slim4/lib/Api/AbstractUserApi.php
index 461df8690620..a3d104a03068 100644
--- a/samples/server/petstore/php-slim4/lib/Api/AbstractUserApi.php
+++ b/samples/server/petstore/php-slim4/lib/Api/AbstractUserApi.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/lib/App/RegisterDependencies.php b/samples/server/petstore/php-slim4/lib/App/RegisterDependencies.php
index 83b8452fad8b..bd7550d68ede 100644
--- a/samples/server/petstore/php-slim4/lib/App/RegisterDependencies.php
+++ b/samples/server/petstore/php-slim4/lib/App/RegisterDependencies.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 declare(strict_types=1);
 
 /**
diff --git a/samples/server/petstore/php-slim4/lib/App/RegisterMiddlewares.php b/samples/server/petstore/php-slim4/lib/App/RegisterMiddlewares.php
index 120d91dede9e..d7629a54f386 100644
--- a/samples/server/petstore/php-slim4/lib/App/RegisterMiddlewares.php
+++ b/samples/server/petstore/php-slim4/lib/App/RegisterMiddlewares.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 declare(strict_types=1);
 
 /**
diff --git a/samples/server/petstore/php-slim4/lib/App/RegisterRoutes.php b/samples/server/petstore/php-slim4/lib/App/RegisterRoutes.php
index 9bb345972869..1503d7ff1a68 100644
--- a/samples/server/petstore/php-slim4/lib/App/RegisterRoutes.php
+++ b/samples/server/petstore/php-slim4/lib/App/RegisterRoutes.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 declare(strict_types=1);
 
 /**
diff --git a/samples/server/petstore/php-slim4/lib/App/ResponseEmitter.php b/samples/server/petstore/php-slim4/lib/App/ResponseEmitter.php
index 3923fef3153c..2faeeafd8050 100644
--- a/samples/server/petstore/php-slim4/lib/App/ResponseEmitter.php
+++ b/samples/server/petstore/php-slim4/lib/App/ResponseEmitter.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 declare(strict_types=1);
 
 /**
diff --git a/samples/server/petstore/php-slim4/lib/Auth/AbstractAuthenticator.php b/samples/server/petstore/php-slim4/lib/Auth/AbstractAuthenticator.php
index b253a0f84bb7..3d01e2694c1c 100644
--- a/samples/server/petstore/php-slim4/lib/Auth/AbstractAuthenticator.php
+++ b/samples/server/petstore/php-slim4/lib/Auth/AbstractAuthenticator.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/lib/BaseModel.php b/samples/server/petstore/php-slim4/lib/BaseModel.php
index b0040c1a5575..0cd93c9fe7d6 100644
--- a/samples/server/petstore/php-slim4/lib/BaseModel.php
+++ b/samples/server/petstore/php-slim4/lib/BaseModel.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/lib/Model/ApiResponse.php b/samples/server/petstore/php-slim4/lib/Model/ApiResponse.php
index bd0edc18f10a..5f276ae63f8c 100644
--- a/samples/server/petstore/php-slim4/lib/Model/ApiResponse.php
+++ b/samples/server/petstore/php-slim4/lib/Model/ApiResponse.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/lib/Model/Category.php b/samples/server/petstore/php-slim4/lib/Model/Category.php
index 584fe5d7d3b0..bbeec5bdc2fc 100644
--- a/samples/server/petstore/php-slim4/lib/Model/Category.php
+++ b/samples/server/petstore/php-slim4/lib/Model/Category.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/lib/Model/Order.php b/samples/server/petstore/php-slim4/lib/Model/Order.php
index 1422e6efcf4b..eec2342062ff 100644
--- a/samples/server/petstore/php-slim4/lib/Model/Order.php
+++ b/samples/server/petstore/php-slim4/lib/Model/Order.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/lib/Model/Pet.php b/samples/server/petstore/php-slim4/lib/Model/Pet.php
index f249c10dfac4..3bbe551628d9 100644
--- a/samples/server/petstore/php-slim4/lib/Model/Pet.php
+++ b/samples/server/petstore/php-slim4/lib/Model/Pet.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/lib/Model/Tag.php b/samples/server/petstore/php-slim4/lib/Model/Tag.php
index 81d7a6e26a6f..5d315a9ae398 100644
--- a/samples/server/petstore/php-slim4/lib/Model/Tag.php
+++ b/samples/server/petstore/php-slim4/lib/Model/Tag.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/lib/Model/User.php b/samples/server/petstore/php-slim4/lib/Model/User.php
index 68494ec67b5c..bae01519f9ed 100644
--- a/samples/server/petstore/php-slim4/lib/Model/User.php
+++ b/samples/server/petstore/php-slim4/lib/Model/User.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/public/index.php b/samples/server/petstore/php-slim4/public/index.php
index 1868cac95761..fa9c9777716a 100644
--- a/samples/server/petstore/php-slim4/public/index.php
+++ b/samples/server/petstore/php-slim4/public/index.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-slim4/tests/BaseModelTest.php b/samples/server/petstore/php-slim4/tests/BaseModelTest.php
index 33325cc198c9..75fb916cb84d 100644
--- a/samples/server/petstore/php-slim4/tests/BaseModelTest.php
+++ b/samples/server/petstore/php-slim4/tests/BaseModelTest.php
@@ -2,7 +2,7 @@
 
 /**
  * OpenAPI Petstore
- * PHP version 7.4
+ * PHP version 8.1
  *
  * @package OpenAPIServer
  * @author  OpenAPI Generator team
@@ -15,6 +15,7 @@
  * Generated by: https://github.com/openapitools/openapi-generator.git
  */
 
+
 /**
  * NOTE: This class is auto generated by the openapi generator program.
  * https://github.com/openapitools/openapi-generator
diff --git a/samples/server/petstore/php-symfony/SymfonyBundle-php/composer.json b/samples/server/petstore/php-symfony/SymfonyBundle-php/composer.json
index fdce9d5c69c3..42cd7134c0bb 100644
--- a/samples/server/petstore/php-symfony/SymfonyBundle-php/composer.json
+++ b/samples/server/petstore/php-symfony/SymfonyBundle-php/composer.json
@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": ">=8.1",
+        "php": "^8.1",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",