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。

代码如下:

//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();

}