<?php /* * Copyright (c) Alexandre Gomes Gaigalas <alganet@gmail.com> * SPDX-License-Identifier: MIT */ declare(strict_types=1); namespace Respect\Validation\Rules; use function ctype_alpha; /** * Validates whether the input contains only alphabetic characters. * * @author Alexandre Gomes Gaigalas <alganet@gmail.com> * @author Henrique Moody <henriquemoody@gmail.com> * @author Nick Lombard <github@jigsoft.co.za> */ final class Alpha extends AbstractFilterRule { /** * {@inheritDoc} */ protected function validateFilteredInput(string $input): bool { return ctype_alpha($input); } }