Laravel Collection Public API: transform

transform(callable $callback)

The transform is identical to the map method, but instead of returning a new Collection instance, the transform method will modify the original collection instance. The transform method will return a reference to the original collection instance.

The following code example will demonstrate the usage of the transform method:

 1<?php
 2 
 3use Illuminate\Support\Collection;
 4 
 5// Create a new collection instance.
 6$collection = new Collection([
 7    'first', 'second', 'third'
 8]);
 9 
10// Modify the original and change the case of
11// each string to upper-case.
12$collection->transform(function($item, $key) {
13    return strtoupper($item);
14});

After the above code example has executed, the $collection variable would would contain a value similar to the following output:

1object(Illuminate\Support\Collection)[133]
2  protected 'items' =>
3    array (size=3)
4      0 => string 'FIRST' (length=5)
5      1 => string 'SECOND' (length=6)
6      2 => string 'THIRD' (length=5)

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