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UuidV1.php
<?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) { $this->uid = uuid_create(static::TYPE); } else { parent::__construct($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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