怎么用php发送http请求

var _loader:URLloader;
_loader = new URLLoader();
//建立事件的侦听

configureListeners(_loader);
//建立urlloader的数据

var loaderData:URLVariables = new URLVariables();
loaderData.userName = "kidliu";
loaderData.passWord = "123456";
//建立请求地址

var url:String = "localhost/login.php";

var request:URLRequest = new URLRequest(url);

//把数据和请求邦定

request.data = loaderData;
//设定请求的方式

request.method = URLRequestMethod.POST;

try {

_loader.load(request);

} catch (error:Error) {

trace(error);

}
private function configureListeners(dispatcher:IEventDispatcher):void {

//加载完成事件;

dispatcher.addEventListener(Event.COMPLETE, loaderHandler);

//开始访问事件;

dispatcher.addEventListener(Event.OPEN, loaderHandler);

//加载进度事件;

dispatcher.addEventListener(ProgressEvent.PROGRESS, loaderHandler);

//跨域访问安全策略事件;

dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR, loaderHandler);

//Http状态事件;

dispatcher.addEventListener(HTTPStatusEvent.HTTP_STATUS, loaderHandler);

//访问出错事件;

dispatcher.addEventListener(IOErrorEvent.IO_ERROR, loaderHandler);

}
private function loaderHandler(event:*):void

{

switch(event.type) {

case Event.COMPLETE:

trace("成功: " + _loader.data);

break;

case Event.OPEN:

trace("open: " + event);

break;

case ProgressEvent.PROGRESS:

trace("progress: " + event);

break;

case SecurityErrorEvent.SECURITY_ERROR:

trace("securityError: " + event);