PHP写xml文档

header("content-type:text/xml;charset=utf-8");			$xml = new SimpleXMLElement("
    
    ");//			$item = $xml->addChild('name','xxx'); 			foreach($userData as $key=>$val){				$item = $xml->addChild("user");								$user = $item->addChild('name',$val['name']);				$user = $item->addChild('pwd',$val['pwd']);							}			echo $xml->asXML();			$xml->asXML("User.xml");