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vendor/workerman/validation/library/Rules/Bsn.php

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+<?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 ctype_digit;
+use function mb_strlen;
+
+/**
+ * Validates a Dutch citizen service number (BSN).
+ *
+ * @see https://nl.wikipedia.org/wiki/Burgerservicenummer
+ *
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Ronald Drenth <ronalddrenth@gmail.com>
+ * @author William Espindola <oi@williamespindola.com.br>
+ */
+final class Bsn extends AbstractRule
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        if (!ctype_digit($input)) {
+            return false;
+        }
+
+        if (mb_strlen($input) !== 9) {
+            return false;
+        }
+
+        $sum = -1 * $input[8];
+        for ($i = 9; $i > 1; --$i) {
+            $sum += $i * $input[9 - $i];
+        }
+
+        return $sum !== 0 && $sum % 11 === 0;
+    }
+}