yii\sphinx\Query::queryScalar PHP Метод

    protected function queryScalar($selectExpression, $db)
    {
        $select = $this->select;
        $limit = $this->limit;
        $offset = $this->offset;
        $this->select = [$selectExpression];
        $this->limit = null;
        $this->offset = null;
        $command = $this->createCommand($db);
        $this->select = $select;
        $this->limit = $limit;
        $this->offset = $offset;
        if (empty($this->groupBy) && empty($this->union) && !$this->distinct) {
            return $command->queryScalar();
        } else {
            return (new Query())->select([$selectExpression])->from(['c' => $this])->createCommand($command->db)->queryScalar();
        }
    }