Laravel 5: Determining if an Array Contains an Element With exists

The exists helper method is similar to PHP's array_key_exists function in that in can be used to check if the given $key or index exists with the provided $array. The exists method defines two parameters, and both are required.

#Signature

The signature of the exists method is:

1public static function exists(
2    $array,
3    $key
4);

#Example Use

The following examples demonstrate the usage of the exists method. The results of the method call will appear above the call as a comment.

 1use Illuminate\Support\Arr;
 2 
 3// Create some test data to work with.
 4$array = [
 5    'first_name' => 'Jane',
 6    'last_name'  => 'Doe'
 7];
 8 
 9$collection = collect($array);
10$model      = factory('App\User')->make();
11 
12// true
13Arr::exists($array, 'first_name');
14Arr::exists($array, 'last_name');
15 
16// false
17Arr::exists($array, 'middle_name');
18 
19// true
20Arr::exists($collection, 'first_name');
21Arr::exists($collection, 'last_name');
22 
23// false
24Arr::exists($collection, 'middle_name');
25 
26// true
27Arr::exists($model, 'name');
28Arr::exists($model, 'email');
29Arr::exists($model, 'remember_token');
30 
31// false
32Arr::exists($model, 'first_name');

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