This is a list of books currently on my To Read shelf... literally. I do not suggest or anti-suggest any of them at this time as I haven't read them yet.
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As of Google IO this year, Google App Engine officially supports PHP. While it's still in beta, you can tweak your applications and give it a try right now. I've included some of my lessons learned from getting Twilio's quickstarts functional on GAE.
You can read the results here: Getting started with Twilio on Google App Engine for PHP.
And I also have a followup being published with php|Architect in the next month or two.