织梦后台登陆空白怎么办

function fix_session_register(){    
    function session_register(){    
        $args = func_get_args();    
        foreach ($args as $key){    
            $_SESSION[$key]=$GLOBALS[$key];    
        }    
    }    
    function session_is_registered($key){    
        return isset($_SESSION[$key]);    
    }    
    function session_unregister($key){    
        unset($_SESSION[$key]);    
    }    
}    
if (!function_exists('session_register')) fix_session_register();