application: helloworld
version: 1
runtime: php
api_version: 1

handlers:
- url: /.*
  script: helloworld.php

application: helloworld
version: 1
runtime: php55
api_version: 1

handlers:
- url: /.*
  script: helloworld.php

Change runtime from 'php' to 'php55'.
Change runtime from 'php' to 'php55'.
