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vendor/workerman/validation/library/Rules/Nip.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 array_map;
+use function is_scalar;
+use function preg_match;
+use function str_split;
+
+/**
+ * Validates whether the input is a Polish VAT identification number (NIP).
+ *
+ * @see https://en.wikipedia.org/wiki/VAT_identification_number
+ *
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Tomasz Regdos <tomek@regdos.com>
+ */
+final class Nip extends AbstractRule
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        if (!is_scalar($input)) {
+            return false;
+        }
+
+        if (!preg_match('/^\d{10}$/', (string) $input)) {
+            return false;
+        }
+
+        $weights = [6, 5, 7, 2, 3, 4, 5, 6, 7];
+        $digits = array_map('intval', str_split((string) $input));
+
+        $targetControlNumber = $digits[9];
+        $calculateControlNumber = 0;
+
+        for ($i = 0; $i < 9; ++$i) {
+            $calculateControlNumber += $digits[$i] * $weights[$i];
+        }
+
+        $calculateControlNumber = $calculateControlNumber % 11;
+
+        return $targetControlNumber == $calculateControlNumber;
+    }
+}