actionscript里面如何上传文件到服务端

as3+PHP上传文件到服务器，as3的写法：

package 
{
import flash.display.Sprite;
import flash.events.*;
import flash.net.FileFilter;
import flash.net.FileReference;
import flash.net.URLRequest;

public class main extends Sprite
{
private var uploadURL:URLRequest;
private var file:FileReference;

public function main()
{
uploadURL = new URLRequest  ;
uploadURL.url = "http://localhost/test/wfile.php";
file = new FileReference  ;
configureListeners(file);
file.browse(getTypes());
}

private function configureListeners(dispatcher:IEventDispatcher):void
{
dispatcher.addEventListener(Event.CANCEL,cancelHandler);
dispatcher.addEventListener(Event.COMPLETE,completeHandler);
dispatcher.addEventListener(HTTPStatusEvent.HTTP_STATUS,httpStatusHandler);
dispatcher.addEventListener(IOErrorEvent.IO_ERROR,ioErrorHandler);
dispatcher.addEventListener(Event.OPEN,openHandler);
dispatcher.addEventListener(ProgressEvent.PROGRESS,progressHandler);
dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR,securityErrorHandler);
dispatcher.addEventListener(Event.SELECT,selectHandler);
dispatcher.addEventListener(DataEvent.UPLOAD_COMPLETE_DATA,uploadCompleteDataHandler);
}

private function getTypes():Array
{
var allTypes:Array = new Array(getImageTypeFilter(),getTextTypeFilter());
return allTypes;
}

private function getImageTypeFilter():FileFilter
{
return new FileFilter("Images (*.jpg, *.jpeg, *.gif, *.png)","*.jpg;*.jpeg;*.gif;*.png");
}

private function getTextTypeFilter():FileFilter
{
return new FileFilter("Text Files (*.txt, *.rtf)","*.txt;*.rtf");
}

private function cancelHandler(event:Event):void
{
trace(("cancelHandler: " + event));
}

private function completeHandler(event:Event):void
{
trace(("completeHandler: " + event));

}

private function uploadCompleteDataHandler(event:DataEvent):void
{
trace(("uploadCompleteData: " + event));
trace(event.data);
img.source=event.data;
}

private function httpStatusHandler(event:HTTPStatusEvent):void
{
trace(("httpStatusHandler: " + event));
}

private function ioErrorHandler(event:IOErrorEvent):void
{
trace(("ioErrorHandler: " + event));
}

private function openHandler(event:Event):void
{
trace(("openHandler: " + event));
}

private function progressHandler(event:ProgressEvent):void
{
var file:FileReference = FileReference(event.target);
trace(((((("progressHandler name=" + file.name) + " bytesLoaded=") + event.bytesLoaded) + " bytesTotal=") + event.bytesTotal));
}

private function securityErrorHandler(event:SecurityErrorEvent):void
{
trace(("securityErrorHandler: " + event));
}

private function selectHandler(event:Event):void
{
var file:FileReference = FileReference(event.target);
trace(((("selectHandler: name=" + file.name) + " URL=") + uploadURL.url));
file.upload(uploadURL);

}
}
}