51 lines
1.1 KiB
PHP
51 lines
1.1 KiB
PHP
<?php
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/*
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* This file is part of Respect/Validation.
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*
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* (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
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*
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* For the full copyright and license information, please view the LICENSE file
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* that was distributed with this source code.
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*/
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declare(strict_types=1);
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namespace Respect\Validation\Rules;
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use function ctype_digit;
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use function mb_strlen;
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/**
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* Validates a Dutch citizen service number (BSN).
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*
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* @see https://nl.wikipedia.org/wiki/Burgerservicenummer
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*
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* @author Henrique Moody <henriquemoody@gmail.com>
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* @author Ronald Drenth <ronalddrenth@gmail.com>
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* @author William Espindola <oi@williamespindola.com.br>
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*/
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final class Bsn extends AbstractRule
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{
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/**
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* {@inheritDoc}
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*/
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public function validate($input): bool
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{
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if (!ctype_digit($input)) {
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return false;
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}
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if (mb_strlen($input) !== 9) {
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return false;
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}
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$sum = -1 * $input[8];
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for ($i = 9; $i > 1; --$i) {
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$sum += $i * $input[9 - $i];
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}
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return $sum !== 0 && $sum % 11 === 0;
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}
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}
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