
Код:
php_loader = new URLLoader();
php_request = new URLRequest(wayToPHP);
php_vars = new URLVariables();
php_vars.param1 = 1;
php_vars.param2 = 2;
php_request.data = php_vars;
php_loader.addEventListener(Event.COMPLETE, onServerAnswer);
php_loader.load(php_request);

Код:
function onServerAnswer(e:Event):void {
var loader:URLLoader = URLLoader(e.target);
var vars:URLVariables = new URLVariables(loader.data);
var loadedXML:XML = XML(vars.xmlData);
(answer_txt as TextField).text = loadedXML.test;
}