Check if values in array are in another array using Laravel Validation

Question

I want to check if all the values of my input, an array, are in another array. For example:

$my_arr = ['item1', 'item2', 'item3', 'item4'];

Validator::make($request, [
            'item' => [ /* what do i put here??? */ ],
        ]);

I don't think the rule in works, because that expects a single value as input, not an array. in_array doesn't work either. I've tried creating a custom rule or closure, but neither of those allow me to pass in a parameter (the array I want to check against). Especially since I want this same functionality for multiple arrays, for different inputs, it would be nice to have a generic rule that works for any array I give it.

If that's not possible, I suppose I need to create a rule for each specific array and use !array_diff($search_this, $all) as this answer says. Is there an alternative to this?

Sumit Wadhwa · Accepted Answer · 2021-01-28 09:28:32Z

1

True that in doesn't accept an array but a string. So you can just convert the array into a string.

$my_arr = ['item1', 'item2', 'item3', 'item4'];

Validator::make($request, [
   'item' => [ 'in:' . implode(',', $my_arr) ],
]);

implode

Another better solution might be to use Illuminate\Validation\Rule's in method that accepts an array:

'item' => [ Rule::in($my_arr) ],

Laravel Validation - Rule::in

edited Jan 28, 2021 at 9:28

answered Jan 28, 2021 at 4:16

Sumit Wadhwa

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1 Comment

the_sky_is_pink Over a year ago

Wait, so the validation rule works even if the input is an array? Just checking because that wasn't specified in the Laravel documentation.

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