[RFC] Add support for endianness modifier in pack()/unpack() format codes

Author: alexandre-daubois

NEWS

@@ -124,6 +124,8 @@ PHP                                                                        NEWS
   . Fix NUL byte truncation in sqlite3 TEXT column handling. (ndossche)
 
 - Standard:
+  . Added endianness modifiers (<, >) for integer and floating-point format
+    codes in pack() and unpack(). (alexandre-daubois)
   . Fixed bug GH-19926 (reset internal pointer earlier while splicing array
     while COW violation flag is still set). (alexandre-daubois)
   . Added form feed (\f) in the default trimmed characters of trim(), rtrim()