Typecho二开之新增用户过期判断方法

/**
     * 是否已经登录
     *
     * @access private
     * @var boolean
     */
    private $_hasLogin = NULL;

  /**
     * 判断用户是否过期
     *
     * @access public
     * @return boolean
     */
    public function hasExtime()
    {
        if (NULL !== $this->_hasExtime) {
            return $this->_hasExtime;
        } else {
            $cookieUid = Typecho_Cookie::get('__typecho_uid');
            if (NULL !== $cookieUid) {
                /** 验证登陆 */
                $user = $this->db->fetchRow($this->db->select()->from('table.users')
                    ->where('uid = ?', intval($cookieUid))
                    ->limit(1));
                if($user['exp_time']>time()){
                    return ($this->_hasExtime = true);
                }
            }
            return ($this->_hasExtime = false);
        }
    }

if($this->user->hasExtime()){
echo '未过期';
}else{
echo '已过期';
}