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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);
}
}
}