You can send varibles by wrapping them in a HTTPService
request each variable you want to send wrap in a mxml tag ie in php
= $phpVariable, $phpVariable2, then you send your variables from
flex as follows. (phpVariable2 is sent from a user input form item
called phpUserVariable)
<mx:HTTPService id="phpRequest" url="PHP.php"
useProxy="false" method="POST" >
<mx:request>
<phpVariable>phpVariabletoSend</phpVariable><phpVariable2>{phpUserVariable.text}</phpVariable>
</mx:request>
</mx:HTTPService>