Viewing file:  UuidV1.php (2.04 KB) -rw-r--r--
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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 v1 UUID contains a 60-bit timestamp and 62 extra unique bits.
*
* @author Grégoire Pineau <lyrixx@lyrixx.info>
*/
class UuidV1 extends Uuid implements TimeBasedUidInterface
{
protected const TYPE = 1;
private static string $clockSeq;
public function __construct(?string $uuid = null)
{
if (null === $uuid) {
$this->uid = strtolower(uuid_create(static::TYPE));
} else {
parent::__construct($uuid, true);
}
}
public function getDateTime(): \DateTimeImmutable
{
return BinaryUtil::hexToDateTime('0'.substr($this->uid, 15, 3).substr($this->uid, 9, 4).substr($this->uid, 0, 8));
}
public function getNode(): string
{
return uuid_mac($this->uid);
}
public static function generate(?\DateTimeInterface $time = null, ?Uuid $node = null): string
{
$uuid = !$time || !$node ? uuid_create(static::TYPE) : parent::NIL;
if ($time) {
if ($node) {
// use clock_seq from the node
$seq = substr($node->uid, 19, 4);
} elseif (!$seq = self::$clockSeq ?? '') {
// generate a static random clock_seq to prevent any collisions with the real one
$seq = substr($uuid, 19, 4);
do {
self::$clockSeq = sprintf('%04x', random_int(0, 0x3FFF) | 0x8000);
} while ($seq === self::$clockSeq);
$seq = self::$clockSeq;
}
$time = BinaryUtil::dateTimeToHex($time);
$uuid = substr($time, 8).'-'.substr($time, 4, 4).'-1'.substr($time, 1, 3).'-'.$seq.substr($uuid, 23);
}
if ($node) {
$uuid = substr($uuid, 0, 24).substr($node->uid, 24);
}
return $uuid;
}
}
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