如何测试与php文件的连接？

public function processCreate():void {

var urlVars:URLVariables = new URLVariables();

var urlFileRequest:URLRequest = new URLRequest("php/controlpanel.php");

urlFileRequest.method = URLRequestMethod.POST;

urlFileRequest.data = urlVars;

var php2Loader:URLLoader = new URLLoader();

php2Loader.dataFormat = URLLoaderDataFormat.VARIABLES;  

php2Loader.addEventListener(Event.COMPLETE, showResult);

urlVars.systemCall = "createprofile";

urlVars.username = username.text;

urlVars.password = password.text;

php2Loader.load(phpFileRequest);

}
public function processCreate():void {

var url