Running PHP on GAE

Steps to run Quercus (Java-based PHP interpreter) on Google App Engine:

1. Download Resin-4.x.x from http://caucho.com/download
2. Copy lib/resin.jar to your WEB-INF/lib 
3. Add com.caucho.quercus.servlet.GoogleQuercusServlet as a standard servlet in your web.xml
4. Add index.php pages to your web-app

Reference:
http://blog.herbert.groot.jebbink.nl/2009/05/using-php-on-gae.html
http://wiki.caucho.com/Quercus_Google_App_Engine