DZ获取UID

<?php
//引用discuz配置文件
require('./config/config_global.php');
require('./source/class/class_core.php');
$discuz = & discuz_core::instance();//以下代码为创建及初始化对象
$discuz->cachelist = $cachelist;
$discuz->init();//以上是调用discuz公共执行类等核心代码
global $_G;
if($_SERVER['REQUEST_METHOD']=="GET")
{
    header("Content-type: text/html; charset=utf-8");
    if($_G['uid']!="0")
     echo $_G['uid'];
    else
    {
        header('Location:http://mtctp.cn/forum.php?mod=viewthread&tid=14&extra=page%3D1');
    }
}
?>
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