请问QQ互联的代码是怎么写的？？
<?php <br />
//应用的APPID<br />
$app_id = "xxxxx";<br />
//应用的APPKEY<br />
$app_secret = "xxxxxxx";<br />
//成功授权后的回调地址<br />
$my_url = "http://www.abc.com";<br />
<br />
//Step1：获取Authorization Code<br />
session_start();<br />
$code = $_REQUEST["code"];<br />
if(empty($code)) <br />
{<br />
//state参数用于防止CSRF攻击，成功授权后回调时会原样带回<br />
$_SESSION['state'] = md5(uniqid(rand(), TRUE)); <br />
//拼接URL <br />
$dialog_url = "https://graph.qq.com/oauth2.0/authorize?response_type=code&client_id=" <br />
. $app_id . "&redirect_uri=" . urlencode($my_url) . "&state="<br />
. $_SESSION['state'];<br />
echo("<script> top.location.href='" . $dialog_url . "'</script>");<br />
}<br />
<br />
//Step2：通过Authorization Code获取Access Token<br />
if($_REQUEST['state'] == $_SESSION['state']) <br />
{<br />
//拼接URL <br />
$token_url = "https://graph.qq.com/oauth2.0/token?grant_type=authorization_code&"<br />
. "client_id=" . $app_id . "&redirect_uri=" . urlencode($my_url)<br />
. "&client_secret=" . $app_secret . "&code=" . $code;<br />
$response = file_get_contents($token_url);<br />
if (strpos($response, "callback") !== false)<br />
{<br />
$lpos = strpos($response, "(");<br />
$rpos = strrpos($response, ")");<br />
$response = substr($response, $lpos + 1, $rpos - $lpos -1);<br />
$msg = json_decode($response);<br />
if (isset($msg->error))<br />
{<br />
echo "<h3>error:</h3>" . $msg->error;<br />
echo "<h3>msg :</h3>" . $msg->error_description;<br />
exit;<br />
}<br />
}<br />
<br />
//Step3：使用Access Token来获取用户的OpenID<br />
$params = array();<br />
parse_str($response, $params);<br />
$graph_url = "https://graph.qq.com/oauth2.0/me?access_token=".$params['access_token'];<br />
$str = file_get_contents($graph_url);<br />
if (strpos($str, "callback") !== false)<br />
{<br />
$lpos = strpos($str, "(");<br />
$rpos = strrpos($str, ")");<br />
$str = substr($str, $lpos + 1, $rpos - $lpos -1);<br />
}<br />
$user = json_decode($str);<br />
if (isset($user->error))<br />
{<br />
echo "<h3>error:</h3>" . $user->error;<br />
echo "<h3>msg :</h3>" . $user->error_description;<br />
exit;<br />
}<br />
echo("Hello " . $user->openid);<br />
}<br />
else <br />
{<br />
echo("The state does not match. You may be a victim of CSRF.");<br />
}<br />
?>
