Set grouping criteria

# CollectionFind::groupBy

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CollectionFind::groupBy — Set grouping criteria

### Description

public mysql_xdevapi\CollectionFind::groupBy(string `$sort_expr`): mysql_xdevapi\CollectionFind

This function can be used to group the result set by one or more columns. It is often used with aggregate functions such as `COUNT`, `MAX`, `MIN`, `SUM` etc.

### Parameters

`sort_expr`

  The column or columns that have to be used for the group operation, this can either be a single string or an array of string arguments, one for each column.

### Return Values

A CollectionFind object that can be used for further processing.

### Examples

Example #1 mysql_xdevapi\CollectionFind::groupBy() example

`<?php
// Assuming $coll is a valid Collection object
// Extract all the documents from the Collection and group the results by the 'name' field
$res = $coll->find()->groupBy('name')->execute();
?>`
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