Diff PHP and Python proto generated code

PHP

<?php
// DO NOT EDIT! Generated by Protobuf-PHP protoc plugin @package_version@
// Source: protos.proto
//   Date: 2012-09-18 08:38:34

namespace  {

  class B extends \DrSlump\Protobuf\Message {


    /** @var \Closure[] */
    protected static $__extensions = array();

    public static function descriptor()
    {
      $descriptor = new \DrSlump\Protobuf\Descriptor(__CLASS__, '.B');

      foreach (self::$__extensions as $cb) {
        $descriptor->addField($cb(), true);
      }

      return $descriptor;
    }
  }
}

namespace  {

  class A extends \DrSlump\Protobuf\Message {

    /**  @var string */
    public $first = null;
    

    /** @var \Closure[] */
    protected static $__extensions = array();

    public static function descriptor()
    {
      $descriptor = new \DrSlump\Protobuf\Descriptor(__CLASS__, '.A');

      // OPTIONAL STRING first = 1
      $f = new \DrSlump\Protobuf\Field();
      $f->number    = 1;
      $f->name      = "first";
      $f->type      = \DrSlump\Protobuf::TYPE_STRING;
      $f->rule      = \DrSlump\Protobuf::RULE_OPTIONAL;
      $descriptor->addField($f);

      foreach (self::$__extensions as $cb) {
        $descriptor->addField($cb(), true);
      }

      return $descriptor;
    }

    /**
     * Check if <first> has a value
     *
     * @return boolean
     */
    public function hasFirst(){
      return $this->_has(1);
    }
    
    /**
     * Clear <first> value
     *
     * @return \A
     */
    public function clearFirst(){
      return $this->_clear(1);
    }
    
    /**
     * Get <first> value
     *
     * @return string
     */
    public function getFirst(){
      return $this->_get(1);
    }
    
    /**
     * Set <first> value
     *
     * @param string $value
     * @return \A
     */
    public function setFirst( $value){
      return $this->_set(1, $value);
    }
  }
}

Python

# Generated by the protocol buffer compiler.  DO NOT EDIT!

from google.protobuf import descriptor
from google.protobuf import message
from google.protobuf import reflection
from google.protobuf import descriptor_pb2
# @@protoc_insertion_point(imports)



DESCRIPTOR = descriptor.FileDescriptor(
  name='protos.proto',
  package='',
  serialized_pb='\n\x0cprotos.proto\"\x17\n\x01\x42\x32\x12\n\x06second\x12\x02.A\x18\x02 \x01(\t\"\x18\n\x01\x41\x12\r\n\x05\x66irst\x18\x01 \x01(\t*\x04\x08\x02\x10\x04')




_B = descriptor.Descriptor(
  name='B',
  full_name='B',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
  ],
  extensions=[
    descriptor.FieldDescriptor(
      name='second', full_name='B.second', index=0,
      number=2, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=unicode("", "utf-8"),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=True, extension_scope=None,
      options=None),
  ],
  nested_types=[],
  enum_types=[
  ],
  options=None,
  is_extendable=False,
  extension_ranges=[],
  serialized_start=16,
  serialized_end=39,
)


_A = descriptor.Descriptor(
  name='A',
  full_name='A',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    descriptor.FieldDescriptor(
      name='first', full_name='A.first', index=0,
      number=1, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=unicode("", "utf-8"),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  options=None,
  is_extendable=True,
  extension_ranges=[(2, 4), ],
  serialized_start=41,
  serialized_end=65,
)

DESCRIPTOR.message_types_by_name['B'] = _B
DESCRIPTOR.message_types_by_name['A'] = _A

class B(message.Message):
  __metaclass__ = reflection.GeneratedProtocolMessageType
  DESCRIPTOR = _B
  
  # @@protoc_insertion_point(class_scope:B)

class A(message.Message):
  __metaclass__ = reflection.GeneratedProtocolMessageType
  DESCRIPTOR = _A
  
  # @@protoc_insertion_point(class_scope:A)

A.RegisterExtension(_B.extensions_by_name['second'])
# @@protoc_insertion_point(module_scope)