I was actually waiting for someone else to answer that may have more experience with this (as I've only done traditional html/php with a mySql database)
The couple times I did use wamp/mamp with FLEX, I just simply copied everthing from my release build into the place where mamp can see them (wamp/www)
and as far as bringing/binding the data back into Flex, have you thought of making xml in php before it gets brought to Flex? That's probably the best way I know of, that and bring them in as value objects through your arraycollection. IE: send your http request out, make a complete event, and then populate your arraycollection with the vo's. You might already be doing that though, and for that I apologize.
Hopefully somebody can weigh in more on this subject. Have you tried asking on stackoverflow or actionscript.org?