ldc-dam/app/Rules/IsValidRole.php

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class IsValidRole implements Rule
{
    /**
     * Determine if the validation rule passes.
     *
     * @param mixed $attribute
     * @param mixed $value
     * @return boolean
     * @phpcs:disable Generic.CodeAnalysis.UnusedFunctionParameter.FoundInImplementedInterfaceBeforeLastUsed
     * @phpcs:disable Squiz.Commenting.FunctionComment.TypeHintMissing
     */
    public function passes($attribute, $value)
    {
        // phpcs:enable
        if (!\ctype_digit(strval($value))) {
            return false;
        };
        return in_array(\strval($value), config('roles.const'));
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'L\'attribut :attribute n\'est pas valide.';
    }
}