diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PhpSymfonyServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PhpSymfonyServerCodegen.java
index 2a3c2ffef01d..fede4f2a34a6 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PhpSymfonyServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PhpSymfonyServerCodegen.java
@@ -417,7 +417,17 @@ public OperationsMap postProcessOperationsWithModels(OperationsMap objs, List<Mo
                 op.vendorExtensions.put("x-comment-type", "void");
             }
             // Create a variable to add typing for return value of interface
-            if (op.returnType != null) {
+            if ("bool".equals(op.returnType)) {
+                op.vendorExtensions.put("x-return-type", "bool");
+            } else if ("UploadedFile".equals(op.returnType)) {
+                op.vendorExtensions.put("x-return-type", "string");
+            } else if ("int".equals(op.returnType)) {
+                op.vendorExtensions.put("x-return-type", "int");
+            } else if ("float".equals(op.returnType)) {
+                op.vendorExtensions.put("x-return-type", "float");
+            } else if ("string".equals(op.returnType)) {
+                op.vendorExtensions.put("x-return-type", "string");
+            } else if (op.returnType != null) {
                 op.vendorExtensions.put("x-return-type", "array|object|null");
             } else {
                 op.vendorExtensions.put("x-return-type", "void");
diff --git a/modules/openapi-generator/src/main/resources/php-symfony/Controller.mustache b/modules/openapi-generator/src/main/resources/php-symfony/Controller.mustache
index 023b66c90f7d..1c3288d813bb 100644
--- a/modules/openapi-generator/src/main/resources/php-symfony/Controller.mustache
+++ b/modules/openapi-generator/src/main/resources/php-symfony/Controller.mustache
@@ -204,6 +204,10 @@ class Controller extends AbstractController
             return 'application/xml';
         }
 
+        if (in_array('*/*', $accept)) {
+            return $produced[0];
+        }
+
         // If we reach this point, we don't have a common ground between server and client
         return null;
     }
diff --git a/modules/openapi-generator/src/main/resources/php-symfony/serialization/JmsSerializer.mustache b/modules/openapi-generator/src/main/resources/php-symfony/serialization/JmsSerializer.mustache
index 9dfabc9733a3..0eabdd486d75 100644
--- a/modules/openapi-generator/src/main/resources/php-symfony/serialization/JmsSerializer.mustache
+++ b/modules/openapi-generator/src/main/resources/php-symfony/serialization/JmsSerializer.mustache
@@ -29,7 +29,12 @@ class JmsSerializer implements SerializerInterface
      */
     public function serialize($data, string $format): string
     {
-        return SerializerBuilder::create()->build()->serialize($data, $this->convertFormat($format));
+       $convertFormat = $this->convertFormat($format);
+       if ($convertFormat !== null) {
+        return SerializerBuilder::create()->build()->serialize($data, $convertFormat);
+       } else {
+         return is_string($data) ? $data : var_export($data, true);
+       }
     }
 
     /**
diff --git a/samples/server/petstore/php-symfony/SymfonyBundle-php/Api/StoreApiInterface.php b/samples/server/petstore/php-symfony/SymfonyBundle-php/Api/StoreApiInterface.php
index 097275dc0a48..4ed7e7079860 100644
--- a/samples/server/petstore/php-symfony/SymfonyBundle-php/Api/StoreApiInterface.php
+++ b/samples/server/petstore/php-symfony/SymfonyBundle-php/Api/StoreApiInterface.php
@@ -77,12 +77,12 @@ public function deleteOrder(
      * @param  int     &$responseCode    The HTTP Response Code
      * @param  array   $responseHeaders  Additional HTTP headers to return with the response ()
      *
-     * @return array|object|null
+     * @return int
      */
     public function getInventory(
         int &$responseCode,
         array &$responseHeaders
-    ): array|object|null;
+    ): int;
 
     /**
      * Operation getOrderById
diff --git a/samples/server/petstore/php-symfony/SymfonyBundle-php/Api/UserApiInterface.php b/samples/server/petstore/php-symfony/SymfonyBundle-php/Api/UserApiInterface.php
index f98deb9fd07d..0689aa1f710f 100644
--- a/samples/server/petstore/php-symfony/SymfonyBundle-php/Api/UserApiInterface.php
+++ b/samples/server/petstore/php-symfony/SymfonyBundle-php/Api/UserApiInterface.php
@@ -147,14 +147,14 @@ public function getUserByName(
      * @param  int     &$responseCode    The HTTP Response Code
      * @param  array   $responseHeaders  Additional HTTP headers to return with the response ()
      *
-     * @return array|object|null
+     * @return string
      */
     public function loginUser(
         string $username,
         string $password,
         int &$responseCode,
         array &$responseHeaders
-    ): array|object|null;
+    ): string;
 
     /**
      * Operation logoutUser
diff --git a/samples/server/petstore/php-symfony/SymfonyBundle-php/Controller/Controller.php b/samples/server/petstore/php-symfony/SymfonyBundle-php/Controller/Controller.php
index e21a2f138131..7d2600dbb6e7 100644
--- a/samples/server/petstore/php-symfony/SymfonyBundle-php/Controller/Controller.php
+++ b/samples/server/petstore/php-symfony/SymfonyBundle-php/Controller/Controller.php
@@ -214,6 +214,10 @@ protected function getOutputFormat(string $accept, array $produced): ?string
             return 'application/xml';
         }
 
+        if (in_array('*/*', $accept)) {
+            return $produced[0];
+        }
+
         // If we reach this point, we don't have a common ground between server and client
         return null;
     }
diff --git a/samples/server/petstore/php-symfony/SymfonyBundle-php/Service/JmsSerializer.php b/samples/server/petstore/php-symfony/SymfonyBundle-php/Service/JmsSerializer.php
index 5abbc6de3fb9..26d852700fa5 100644
--- a/samples/server/petstore/php-symfony/SymfonyBundle-php/Service/JmsSerializer.php
+++ b/samples/server/petstore/php-symfony/SymfonyBundle-php/Service/JmsSerializer.php
@@ -29,7 +29,12 @@ public function __construct()
      */
     public function serialize($data, string $format): string
     {
-        return SerializerBuilder::create()->build()->serialize($data, $this->convertFormat($format));
+       $convertFormat = $this->convertFormat($format);
+       if ($convertFormat !== null) {
+        return SerializerBuilder::create()->build()->serialize($data, $convertFormat);
+       } else {
+         return is_string($data) ? $data : var_export($data, true);
+       }
     }
 
     /**
diff --git a/samples/server/petstore/php-symfony/SymfonyBundle-php/docs/Api/StoreApiInterface.md b/samples/server/petstore/php-symfony/SymfonyBundle-php/docs/Api/StoreApiInterface.md
index b6ed0824d5c8..111a791612e1 100644
--- a/samples/server/petstore/php-symfony/SymfonyBundle-php/docs/Api/StoreApiInterface.md
+++ b/samples/server/petstore/php-symfony/SymfonyBundle-php/docs/Api/StoreApiInterface.md
@@ -107,7 +107,7 @@ class StoreApi implements StoreApiInterface
     /**
      * Implementation of StoreApiInterface#getInventory
      */
-    public function getInventory(int &$responseCode, array &$responseHeaders): array|object|null
+    public function getInventory(int &$responseCode, array &$responseHeaders): int
     {
         // Implement the operation ...
     }
diff --git a/samples/server/petstore/php-symfony/SymfonyBundle-php/docs/Api/UserApiInterface.md b/samples/server/petstore/php-symfony/SymfonyBundle-php/docs/Api/UserApiInterface.md
index 2c7e3ba26260..827393e38c5d 100644
--- a/samples/server/petstore/php-symfony/SymfonyBundle-php/docs/Api/UserApiInterface.md
+++ b/samples/server/petstore/php-symfony/SymfonyBundle-php/docs/Api/UserApiInterface.md
@@ -351,7 +351,7 @@ class UserApi implements UserApiInterface
     /**
      * Implementation of UserApiInterface#loginUser
      */
-    public function loginUser(string $username, string $password, int &$responseCode, array &$responseHeaders): array|object|null
+    public function loginUser(string $username, string $password, int &$responseCode, array &$responseHeaders): string
     {
         // Implement the operation ...
     }