title: php app deployed to GAE successfully, but cannot run it
body: <p>I have a php app which runs perfect on localhost:8080 using GAE launcher. Then I deployed it to the GAE successfully. But I cannot run it after deployment. The warning in the log is: </p>
  
  <pre><code>PHP Warning:  Unknown: failed to open stream: Function not implemented in Unknown on line     
  0
  </code></pre>
  
  <p>I don't know why this happens because the app runs perfect on the localhost. 
  The url of this app is: <a href="http://yapigtest.appspot.com/" rel="nofollow">http://yapigtest.appspot.com/</a></p>
  
  <p>Thanks!</p>