Problem in passing variables beween flash cs5 and php

1

i am having an issue passing variables between flash cs5 and php , this issue didn’t exist in flash cs3 ,even i used the same code that worked before in flash cs3 and still not working with flash cs5

here is a simple example :

in as3 :

var variables:URLVariables = new URLVariables();
            
            // PassingVariables.php and my swf file are in the same folder
            var request:URLRequest = new URLRequest("PassingVariables.php");
            request.method = URLRequestMethod.POST;
            request.data = variables;
            
            var loader:URLLoader = new URLLoader();
            loader.dataFormat = URLLoaderDataFormat.VARIABLES;
            loader.addEventListener(Event.COMPLETE, Loaded);
            
            variables.status = "GetInfo";
            
            loader.load(request);
        
        function Loaded(e:Event):void 
        {
            // username_txt is a textfield in my stage
            var variables1:URLVariables = new URLVariables(e.currentTarget.data);
            username_txt.text = "" + variables1.username;
        }

in php “PassingVariables.php” :

<?php

if($_POST['status'] == "GetInfo")
{
    print "username=kareem";
}

?>