Validate a list of things

ListOfValidator.php

<?php

namespace App\Validators;

use Illuminate\Contracts\Validation\Validator;

class ListOfValidator
{

    public function validate($attribute, $value, $parameters, Validator $validator)
    {

        // extract all the values
        $values = explode(',', $value);

        // reconstitute the parameters
        $newRules = join('|', $parameters);

        // revalidate each value
        foreach ($values as $newValue) {
            $newValidator = \Validator::make(
                ['value' => $newValue],
                ['value' => $newRules]
            );
            if ($newValidator->fails()) {
                return false;
            };
        }

        return true;
    }

}