<?php

/*
 * This file is part of Respect/Validation.
 *
 * (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
 *
 * For the full copyright and license information, please view the LICENSE file
 * that was distributed with this source code.
 */

declare(strict_types=1);

namespace Respect\Validation\Rules;

use function filter_var;

use const FILTER_NULL_ON_FAILURE;
use const FILTER_VALIDATE_BOOLEAN;

/**
 * Validates if a value is considered as false.
 *
 * @author Danilo Correa <danilosilva87@gmail.com>
 * @author Henrique Moody <henriquemoody@gmail.com>
 */
final class FalseVal extends AbstractRule
{
    /**
     * {@inheritDoc}
     */
    public function validate($input): bool
    {
        return filter_var($input, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE) === false;
    }
}
