respect-validation/library/Rules/Cpf.php

<?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.md"
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace Respect\Validation\Rules;

use function mb_strlen;
use function preg_match;
use function preg_replace;

/**
 * Validates whether the input is a CPF (Brazilian Natural Persons Register) number.
 *
 * @author Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
 * @author Henrique Moody <henriquemoody@gmail.com>
 * @author Jair Henrique <jair.henrique@gmail.com>
 * @author Jayson Reis <santosdosreis@gmail.com>
 * @author Jean Pimentel <jeanfap@gmail.com>
 * @author William Espindola <oi@williamespindola.com.br>
 */
final class Cpf extends AbstractRule
{
    /**
     * {@inheritdoc}
     */
    public function validate($input): bool
    {
        // Code ported from jsfromhell.com
        $c = preg_replace('/\D/', '', $input);

        if (mb_strlen($c) != 11 || preg_match("/^{$c[0]}{11}$/", $c)) {
            return false;
        }

        $n = 0;
        for ($s = 10, $i = 0; $s >= 2; ++$i, --$s) {
            $n += $c[$i] * $s;
        }

        if ($c[9] != (($n %= 11) < 2 ? 0 : 11 - $n)) {
            return false;
        }

        $n = 0;
        for ($s = 11, $i = 0; $s >= 2; ++$i, --$s) {
            $n += $c[$i] * $s;
        }

        $check = ($n %= 11) < 2 ? 0 : 11 - $n;

        return $c[10] == $check;
    }
}