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vendor/symfony/uid/UuidV4.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Uid;
+
+/**
+ * A v4 UUID contains a 122-bit random number.
+ *
+ * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ */
+class UuidV4 extends Uuid
+{
+    protected const TYPE = 4;
+
+    public function __construct(?string $uuid = null)
+    {
+        if (null === $uuid) {
+            $uuid = random_bytes(16);
+            $uuid[6] = $uuid[6] & "\x0F" | "\x40";
+            $uuid[8] = $uuid[8] & "\x3F" | "\x80";
+            $uuid = bin2hex($uuid);
+
+            $this->uid = substr($uuid, 0, 8).'-'.substr($uuid, 8, 4).'-'.substr($uuid, 12, 4).'-'.substr($uuid, 16, 4).'-'.substr($uuid, 20, 12);
+        } else {
+            parent::__construct($uuid, true);
+        }
+    }
+}