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

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+<?php
+
+/*
+ * Copyright (c) Alexandre Gomes Gaigalas <alganet@gmail.com>
+ * SPDX-License-Identifier: MIT
+ */
+
+declare(strict_types=1);
+
+namespace Respect\Validation\Rules;
+
+use function is_scalar;
+use function ord;
+use function preg_match;
+
+/**
+ * Validates whether the input is a Polish identity card (Dowód Osobisty).
+ *
+ * @see https://en.wikipedia.org/wiki/Polish_identity_card
+ *
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ */
+final class PolishIdCard extends AbstractRule
+{
+    private const ASCII_CODE_0 = 48;
+    private const ASCII_CODE_7 = 55;
+    private const ASCII_CODE_9 = 57;
+    private const ASCII_CODE_A = 65;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        if (!is_scalar($input)) {
+            return false;
+        }
+
+        $input = (string) $input;
+
+        if (!preg_match('/^[A-Z0-9]{9}$/', $input)) {
+            return false;
+        }
+
+        $weights = [7, 3, 1, 0, 7, 3, 1, 7, 3];
+        $weightedSum = 0;
+        for ($i = 0; $i < 9; ++$i) {
+            $code = ord($input[$i]);
+            if ($i < 3 && $code <= self::ASCII_CODE_9) {
+                return false;
+            }
+
+            if ($i > 2 && $code >= self::ASCII_CODE_A) {
+                return false;
+            }
+
+            $difference = $code <= self::ASCII_CODE_9 ? self::ASCII_CODE_0 : self::ASCII_CODE_7;
+            $weightedSum += ($code - $difference) * $weights[$i];
+        }
+
+        return $weightedSum % 10 == $input[3];
+    }
+}