You can run PHP scripts in App Engine in the JVM with Quercus; however, it is still not possible to use mySQL; you need to use the App Engine datastore. This will require rewriting any code that relates to the database, so existing PHP scripts will not work without a big hack.
Note. Support for relational databases is on the App Engine roadmap, but no one knows exactly when it will be available, or if mySQL relational database is available.
geoffspear
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