44 lines
1.3 KiB
PHP
44 lines
1.3 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Uid;
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/**
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* A v4 UUID contains a 122-bit random number.
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*
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* @author Grégoire Pineau <lyrixx@lyrixx.info>
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*/
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class UuidV4 extends Uuid
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{
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protected const TYPE = 4;
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public function __construct(?string $uuid = null)
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{
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if (null === $uuid) {
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// Generate 36 random hex characters (144 bits)
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// xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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$uuid = bin2hex(random_bytes(18));
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// Insert dashes to match the UUID format
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// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
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$uuid[8] = $uuid[13] = $uuid[18] = $uuid[23] = '-';
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// Set the UUID version to 4
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// xxxxxxxx-xxxx-4xxx-xxxx-xxxxxxxxxxxx
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$uuid[14] = '4';
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// Set the UUID variant: the 19th char must be in [8, 9, a, b]
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// xxxxxxxx-xxxx-4xxx-?xxx-xxxxxxxxxxxx
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$uuid[19] = ['8', '9', 'a', 'b', '8', '9', 'a', 'b', 'c' => '8', 'd' => '9', 'e' => 'a', 'f' => 'b'][$uuid[19]] ?? $uuid[19];
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$this->uid = $uuid;
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} else {
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parent::__construct($uuid, true);
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}
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}
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}
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