Laravel 5: Finding the Last Occurrence of an Element Matching a Condition With last

The last helper method is the logical opposite of the first method. The difference is that the last function will return the last value to satisfy the $callback function. If no value is returned from the $callback function, the $default value is returned.

#Signature

The signature of the last method is:

1public static function last(
2    $array,
3    callable $callback = null,
4    $default = null
5);

#Example Use

The following section builds of the code example we covered in the first section; using it, we can find the last post in a list that matches the /post/* format:

1use Illuminate\Support\Str;
2
3$isPostFormat = function($key, $value) {
4    return Str::is('/post/*', $value);
5};

we could get the last post in the following array like so:

 1<?php
 2
 3use Illuminate\Support\Arr;
 4
 5$postsArray = [
 6    '/post/first-post',
 7    '/post/second-post',
 8    '/post/last-post'
 9];
10
11$lastPost = Arr::last(
12    $postsArray,
13    $isPostFormat
14);

the value of $lastPost would be:

/post/last-post

#Optional $callback Parameter

The $callback function is an optional parameter, and can be omitted. When the $callback parameter is omitted, the last method will return the last item in the array:

1<?php
2
3use Illuminate\Support\Arr;
4
5// 'something else'
6$firstItem = Arr::last(
7    $sampleArray
8);

#Global array_last Helper Function

The array_last function is a shortcut to calling Arr::last. This function is declared in the global namespace.

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