flex 和php 通信

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php:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>flex login</title>
</head>
<body>
<?php
$return="";
if(isset($_POST[username]) && isset($_POST[userpwd])){
if ("User"==$_POST[username] && "123456"==$_POST[userpwd])
    $return="ok";
else
    $return="error";
}
$xml_return = '<users>';
$xml_return.= '<a>'.$return.'</a>';
$xml_return.= '</users>';
echo $xml_return;

?>
</body>
</html>

Flex:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
    horizontalAlign="center"
    verticalAlign="middle">
<mx:Script>
  <![CDATA[
   import mx.controls.Alert;
   import mx.rpc.events.ResultEvent;

   private function goLogin():void
   {
    login.send();
   }

   private function resultHandler(event:ResultEvent):void
   {
    Alert.show(event.result.html.body.users.a.toString());
   }
  ]]>
</mx:Script>
<mx:HTTPService id="login"
     method="POST"
     showBusyCursor="true"
     url="http://localhost/php/login.php"
     result="resultHandler(event)">
  <mx:request>
   <username>
                        {username.text}
                   </username>
   <userpwd>
                      {userpwd.text}
                 </userpwd>
  </mx:request>
</mx:HTTPService>
<mx:Panel width="310"
     height="265"
     layout="absolute"
     title="登录"
     fontSize="12"
     fontWeight="normal"
     x="296"
     y="153">
  <mx:TextInput x="93"
       y="51"
       id="username"
       fontSize="12"/>
  <mx:TextInput x="92"
       y="95"
       id="userpwd"
       fontSize="12"
       displayAsPassword="true"/>
  <mx:Button x="73"
       y="154"
       label="登录"
       id="btn1"
       click="goLogin()"
       fontWeight="normal"
       fontSize="12"/>
  <mx:Label x="32"
      y="53"
      text="用户名："
      fontSize="12"/>
  <mx:Label x="43"
      y="97"
      text="密码："
      fontSize="12"/>
  <mx:Button x="154"
       y="154"
       label="注册"
       fontSize="12"
       fontWeight="normal"
       id="btn2"/>
  <mx:Label x="10"
      y="10"
      text="测试用用户名 User 密码 123456"
      fontSize="12"
      width="243"/>
</mx:Panel>
</mx:Application>

重要的把返回结果看作xml,

<html>

<body>

<users>

<a>

</a>

</users>

</body>

</html>