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问题背景：

phpcms前台退出登录的时候，提示了一个退出成功0

让我很困惑为啥有个0呢？

问题分析：

进入

./phpcms/modules/member/index.php

找到logout方法，代码如下：

public function logout() {
        $setting = pc_base::load_config('system');
        //snda退出
        if($setting['snda_enable'] && param::get_cookie('_from')=='snda') {
            param::set_cookie('_from', '');
            $forward = isset($_GET['forward']) && trim($_GET['forward']) ? urlencode($_GET['forward']) : '';
            $logouturl = 'https://cas.sdo.com/cas/logout?url='.urlencode(APP_PATH.'index.php?m=member&c=index&a=logout&forward='.$forward);
            header('Location: '.$logouturl);
        } else {
            $synlogoutstr = '';    //同步退出js代码
            if(pc_base::load_config('system', 'phpsso')) {
                $this->_init_phpsso();
                $synlogoutstr = $this->client->ps_member_synlogout();           
            }
           
            param::set_cookie('auth', '');
            param::set_cookie('_userid', '');
            param::set_cookie('_username', '');
            param::set_cookie('_groupid', '');
            param::set_cookie('_nickname', '');
            param::set_cookie('cookietime', '');
            $forward = isset($_GET['forward']) && trim($_GET['forward']) ? $_GET['forward'] : 'index.php?m=member&c=index&a=login';
            showmessage(L('logout_success').$synlogoutstr, $forward);//退出成功0
        }
    }