public function s_p() {
            $sql = "SELECT COUNT(*) FROM `poll` WHERE `status`='active'";
            $result = Db::sql($sql);
            $row = mysql_fetch_row($result);
            $total = $row[0];
            return $total;
        }
        public function u_p(){
            $sql = "UPDATE `poll` SET `status`='active' WHERE `id` = '{$this->id}'";
            $result = Db::sql($sql);
            return true;
        }


    if($poll->id =(int)$_GET['poll_a']) {
        if ($poll->s_p() > 0) {
            echo "Есть активный опрос";
        } else {
            $poll->u_p();
        }
    }