[PHP] ObjectSerializer conflict with Yii framework 1.1.17

[alex347]

Description

Yii framework's class auto loader fails with the following error:
2017/08/22 09:54:44 [error] [php] include(int.php): failed to open stream: No such file or directory (vendor/yiisoft/yii/framework/YiiBase.php:432)
Stack trace:
#0 unknown(0): spl_autoload_call()
#1 vendor/example/lib/ObjectSerializer.php(68): method_exists()
#2 vendor/example/lib/ApiClient.php(156): sanitizeForSerialization

Swagger-codegen version

2.2.3

Swagger declaration file content or url

swagger: '2.0'
info:
  title: Example
  version: 1.0.0
produces:
  - application/json
paths:
  /example:
    post:
      parameters:
        - name: params
          in: body
          required: true
          schema:
            $ref: '#/definitions/RequestParams'
      responses:
        200:
          description: Success
definitions:
  RequestParams:
    properties:
      UserId:
        type: integer

Command line used for generation

swagger-codegen generate -i swagger.yaml -l php -o php

Steps to reproduce

1. Install Yii framework 1.1.17
2. Run example PHP client code from README.txt

Related issues/PRs

no

Suggest a fix/enhancement

Check if class exists before calling method_exists

[wing328]

@alex347 thanks for reporting the issue. May I know if you've time to contribute the fix?

[alex347]

@wing328 I can take a look at it next week.