出错信息如下：
Warning: session_destroy() [function.session-destroy]: Session object destruction failed in F:\web\system\library\user.php on line 67Warning: Cannot modify header information - headers already sent by (output started at F:\web\admin\index.php:79) in F:\web\system\engine\controller.php on line 28Warning: Cannot modify header information - headers already sent by (output started at F:\web\admin\index.php:79) in F:\web\system\engine\controller.php on line 29