在flash9中使用flash remoting

import flash.net.*;
var hostName:String = "http://localhost/phpweb/";
var gatewayUrl:String = hostName+"gateway.php";
////////////////////////////
var nc:NetConnection = new NetConnection();
nc.objectEncoding = 0;//使用as1和as2兼容的amf编码
nc.connect(gatewayUrl);
nc.call("HelloWorld.say",new Responder(onResult,onFault),"roading");//调用并传递参数
/////////////////////////////
function onResult(re:Object)
{
 trace(re);
}
function onFault(re:Object)
{
 for(var i in re)
 trace(i+"=>"+re[i]);
}

<?php
class HelloWorld
{
function HelloWorld()
{
$this->methodTable = array
(
"say" => array
(
"access" => "remote"
)
);
}

function say($sMessage)
{
// return 'You said: ' . $sMessage;
  $a = array(1,2,3,4);
  return $a;
}
}
?>