Laravel Array Helper Function: array_has

has($array, $key)

The has helper method will return a boolean value that indicates if the given $key exists in the supplied $array, using dot notation. This method is incredibly useful when checking if an array has a specific key at an arbitrary depth.

Considering the following array:

1<?php
2 
3$anArray = [
4    'nested_array_one' => [
5        'nested_array_two' => [
6            'key' => 'value'
7        ]
8    ]
9];

We can determine that the nested key actually does exist:

1<?php
2 
3use Illuminate\Support\Arr;
4 
5$doesExist = Arr::has($anArray, 'nested_array_one.nested_array_two.key');

Because the nested key key does in fact exist, the value of $doesExist would be true. Inversely, we can prove that a key of does_not_exist does not, in fact, exist:

1<?php
2 
3use Illuminate\Support\Arr;
4 
5$doesExist = Arr::has($anArray, 'does_not_exist');

At this point, the value of $doesExist would be false, which is accurate.

Using this method is easier to read than using PHP's isset function and checking at each level of the array whether a particular key exists.

#array_has($array, $key)

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

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