Initial commit

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) {
+            // Generate 36 random hex characters (144 bits)
+            // xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+            $uuid = bin2hex(random_bytes(18));
+            // Insert dashes to match the UUID format
+            // xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+            $uuid[8] = $uuid[13] = $uuid[18] = $uuid[23] = '-';
+            // Set the UUID version to 4
+            // xxxxxxxx-xxxx-4xxx-xxxx-xxxxxxxxxxxx
+            $uuid[14] = '4';
+            // Set the UUID variant: the 19th char must be in [8, 9, a, b]
+            // xxxxxxxx-xxxx-4xxx-?xxx-xxxxxxxxxxxx
+            $uuid[19] = ['8', '9', 'a', 'b', '8', '9', 'a', 'b', 'c' => '8', 'd' => '9', 'e' => 'a', 'f' => 'b'][$uuid[19]] ?? $uuid[19];
+            $this->uid = $uuid;
+        } else {
+            parent::__construct($uuid, true);
+        }
+    }
+}