这个问题折磨了好久，今天特意抽出一些时间来看看discuz的源代码，将部分代码抽取出来，写成函数，这样以后登录与退出只要调用一下这两个函数就可以了。 

//退出Discuz账号 
function discuz_logout(){ 
require './bbs/source/class/class_core.php'; //引入系统核心文件 
$discuz = & discuz_core::instance(); //以下代码为创建及初始化对象 
$discuz->cachelist = $cachelist; 
$discuz->init(); 
require libfile('function/member'); 
require libfile('class/member'); 
$_GET['formhash'] = $_G['formhash']; 
$ctl_obj = new logging_ctl(); 
$ctl_obj->setting = $_G['setting']; 
$method = 'on_logout'; 
//$ctl_obj->template = 'member/login'; 
$ctl_obj->$method(); 
echo "成功退出！".time(); 
} 
//登录Discuz账号 
function discuz_login($username,$password){ 
require 'E:/ku25.com/wwwroot/bbs/source/class/class_core.php'; //引入系统核心文件 
$discuz = & discuz_core::instance(); //以下代码为创建及初始化对象 
$discuz->cachelist = $cachelist; 
$discuz->init(); 
require libfile('function/member'); 
require libfile('class/member'); 
$_GET['formhash'] = $_G['formhash']; 
$_GET['from'] = 1; 
$_GET['loginsubmit'] = $_GET['infloat'] = 'yes'; 
$_GET['cookietime'] = '2592000'; 
$_GET['username'] = $username; 
$_GET['password'] = $password; 
$ctl_obj = new logging_ctl(); 
$ctl_obj->setting = $_G['setting']; 
$method = 'on_login'; 
//$ctl_obj->template = 'member/login'; 
$ctl_obj->$method(); 
echo "成功登录！".time(); 
}