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File / Folder	Size	Action
.	-
Command	--	ren
Factory	--	ren
AbstractUid.php	4.825KB	edt ren
BinaryUtil.php	5.895KB	edt ren
CHANGELOG.md	0.938KB	edt ren
LICENSE	1.043KB	edt ren
MaxUlid.php	0.374KB	edt ren
MaxUuid.php	0.405KB	edt ren
NilUlid.php	0.374KB	edt ren
NilUuid.php	0.461KB	edt ren
README.md	0.59KB	edt ren
TimeBasedUidInterface.php	0.507KB	edt ren
Ulid.php	6.859KB	edt ren
Uuid.php	5.686KB	edt ren
UuidV1.php	2.025KB	edt ren
UuidV3.php	0.578KB	edt ren
UuidV4.php	0.91KB	edt ren
UuidV5.php	0.578KB	edt ren
UuidV6.php	2.023KB	edt ren
UuidV7.php	5.003KB	edt ren
UuidV8.php	0.56KB	edt ren
composer.json	0.9KB	edt ren

<?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 v7 UUID is lexicographically sortable and contains a 48-bit timestamp and 74 extra unique bits.
 *
 * Within the same millisecond, monotonicity is ensured by incrementing the random part by a random increment.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 */
class UuidV7 extends Uuid implements TimeBasedUidInterface
{
    protected const TYPE = 7;

private static string $time = '';
    private static array $rand = [];
    private static string $seed;
    private static array $seedParts;
    private static int $seedIndex = 0;

public function __construct(?string $uuid = null)
    {
        if (null === $uuid) {
            $this->uid = static::generate();
        } else {
            parent::__construct($uuid, true);
        }
    }

public function getDateTime(): \DateTimeImmutable
    {
        $time = substr($this->uid, 0, 8).substr($this->uid, 9, 4);
        $time = \PHP_INT_SIZE >= 8 ? (string) hexdec($time) : BinaryUtil::toBase(hex2bin($time), BinaryUtil::BASE10);

if (4 > \strlen($time)) {
            $time = '000'.$time;
        }

return \DateTimeImmutable::createFromFormat('U.v', substr_replace($time, '.', -3, 0));
    }

public static function generate(?\DateTimeInterface $time = null): string
    {
        if (null === $mtime = $time) {
            $time = microtime(false);
            $time = substr($time, 11).substr($time, 2, 3);
        } elseif (0 > $time = $time->format('Uv')) {
            throw new \InvalidArgumentException('The timestamp must be positive.');
        }

if ($time > self::$time || (null !== $mtime && $time !== self::$time)) {
            randomize:
            self::$rand = unpack('n*', isset(self::$seed) ? random_bytes(10) : self::$seed = random_bytes(16));
            self::$rand[1] &= 0x03FF;
            self::$time = $time;
        } else {
            // Within the same ms, we increment the rand part by a random 24-bit number.
            // Instead of getting this number from random_bytes(), which is slow, we get
            // it by sha512-hashing self::$seed. This produces 64 bytes of entropy,
            // which we need to split in a list of 24-bit numbers. unpack() first splits
            // them into 16 x 32-bit numbers; we take the first byte of each of these
            // numbers to get 5 extra 24-bit numbers. Then, we consume those numbers
            // one-by-one and run this logic every 21 iterations.
            // self::$rand holds the random part of the UUID, split into 5 x 16-bit
            // numbers for x86 portability. We increment this random part by the next
            // 24-bit number in the self::$seedParts list and decrement self::$seedIndex.

if (!self::$seedIndex) {
                $s = unpack('l*', self::$seed = hash('sha512', self::$seed, true));
                $s[] = ($s[1] >> 8 & 0xFF0000) | ($s[2] >> 16 & 0xFF00) | ($s[3] >> 24 & 0xFF);
                $s[] = ($s[4] >> 8 & 0xFF0000) | ($s[5] >> 16 & 0xFF00) | ($s[6] >> 24 & 0xFF);
                $s[] = ($s[7] >> 8 & 0xFF0000) | ($s[8] >> 16 & 0xFF00) | ($s[9] >> 24 & 0xFF);
                $s[] = ($s[10] >> 8 & 0xFF0000) | ($s[11] >> 16 & 0xFF00) | ($s[12] >> 24 & 0xFF);
                $s[] = ($s[13] >> 8 & 0xFF0000) | ($s[14] >> 16 & 0xFF00) | ($s[15] >> 24 & 0xFF);
                self::$seedParts = $s;
                self::$seedIndex = 21;
            }

self::$rand[5] = 0xFFFF & $carry = self::$rand[5] + 1 + (self::$seedParts[self::$seedIndex--] & 0xFFFFFF);
            self::$rand[4] = 0xFFFF & $carry = self::$rand[4] + ($carry >> 16);
            self::$rand[3] = 0xFFFF & $carry = self::$rand[3] + ($carry >> 16);
            self::$rand[2] = 0xFFFF & $carry = self::$rand[2] + ($carry >> 16);
            self::$rand[1] += $carry >> 16;

if (0xFC00 & self::$rand[1]) {
                if (\PHP_INT_SIZE >= 8 || 10 > \strlen($time = self::$time)) {
                    $time = (string) (1 + $time);
                } elseif ('999999999' === $mtime = substr($time, -9)) {
                    $time = (1 + substr($time, 0, -9)).'000000000';
                } else {
                    $time = substr_replace($time, str_pad(++$mtime, 9, '0', \STR_PAD_LEFT), -9);
                }

goto randomize;
            }

$time = self::$time;
        }

if (\PHP_INT_SIZE >= 8) {
            $time = dechex($time);
        } else {
            $time = bin2hex(BinaryUtil::fromBase($time, BinaryUtil::BASE10));
        }

return substr_replace(sprintf('%012s-%04x-%04x-%04x%04x%04x',
            $time,
            0x7000 | (self::$rand[1] << 2) | (self::$rand[2] >> 14),
            0x8000 | (self::$rand[2] & 0x3FFF),
            self::$rand[3],
            self::$rand[4],
            self::$rand[5],
        ), '-', 8, 0);
    }
}