In retrieving your data - what is your php returning to FB, an object, object array, an array? Either way, I have a brief example below that an object(s) is being returned. Pull the data from the lastResult in a ResultEvent. The object instantiated in the resultEvent will contain your data and you can do what you want from there.
Also, I always use Network Monitor to see what data (if any) is being returned from the server, you can also see how it is being sent back.
private function init():void
mp3Array.token = mp3service.getData();
protected function faultHandler(event:FaultEvent):void
Alert.show("There was a fault error!" + event.message, "Fault Error", Alert.OK);
protected function mp3Array_resultHandler(event:ResultEvent):void
// Not sure if your service is sending back an object or an array or ?
var info:Object = mp3Array.lastResult;
protected function doSomeFunction(data:Object):void