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vendor/workerman/validation/library/Rules/Cnpj.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 array_sum;
+use function count;
+use function is_scalar;
+use function preg_replace;
+use function str_split;
+
+/**
+ * Validates if the input is a Brazilian National Registry of Legal Entities (CNPJ) number.
+ *
+ * @author Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Jayson Reis <santosdosreis@gmail.com>
+ * @author Nick Lombard <github@jigsoft.co.za>
+ * @author Renato Moura <renato@naturalweb.com.br>
+ * @author William Espindola <oi@williamespindola.com.br>
+ */
+final class Cnpj extends AbstractRule
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        if (!is_scalar($input)) {
+            return false;
+        }
+
+        // Code ported from jsfromhell.com
+        $bases = [6, 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2];
+        $digits = $this->getDigits((string) $input);
+
+        if (array_sum($digits) < 1) {
+            return false;
+        }
+
+        if (count($digits) !== 14) {
+            return false;
+        }
+
+        $n = 0;
+        for ($i = 0; $i < 12; ++$i) {
+            $n += $digits[$i] * $bases[$i + 1];
+        }
+
+        if ($digits[12] != (($n %= 11) < 2 ? 0 : 11 - $n)) {
+            return false;
+        }
+
+        $n = 0;
+        for ($i = 0; $i <= 12; ++$i) {
+            $n += $digits[$i] * $bases[$i];
+        }
+
+        $check = ($n %= 11) < 2 ? 0 : 11 - $n;
+
+        return $digits[13] == $check;
+    }
+
+    /**
+     * @return int[]
+     */
+    private function getDigits(string $input): array
+    {
+        return array_map(
+            'intval',
+            str_split(
+                (string) preg_replace('/\D/', '', $input)
+            )
+        );
+    }
+}