I am no PHP expert and to not intend to be one, but while I was searching how to integrate Flex with different backends, i came across some tutorials that i believe would help others:
Flex talking to a PHP backend
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Changing the World, one Scribble at a time
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The documentation can be a little overwhelming, but I highly recommend AMFPHP. Since AMF is binary it can reduce your overhead – http://www.amfphp.org/
i second the call to check AMFPHP. i had zero PHP knowledge, and little interesting in gaining any, but was able to get AMFPHP installed and working (includes sending and receiving flex Value Objects) within 15 minutes…
go!