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File Name : TimestampFirstCombCodec.php

<?php

/**
 * This file is part of the ramsey/uuid library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */

declare(strict_types=1);

namespace Ramsey\Uuid\Codec;

use Ramsey\Uuid\Exception\InvalidUuidStringException;
use Ramsey\Uuid\UuidInterface;

use function bin2hex;
use function sprintf;
use function substr;
use function substr_replace;

/**
 * TimestampFirstCombCodec encodes and decodes COMBs, with the timestamp as the first 48 bits
 *
 * In contrast with the TimestampLastCombCodec, the TimestampFirstCombCodec adds the timestamp to the first 48 bits of
 * the COMB. To generate a timestamp-first COMB, set the TimestampFirstCombCodec as the codec, along with the
 * CombGenerator as the random generator.
 *
 * ```
 * $factory = new UuidFactory();
 *
 * $factory->setCodec(new TimestampFirstCombCodec($factory->getUuidBuilder()));
 *
 * $factory->setRandomGenerator(new CombGenerator(
 *     $factory->getRandomGenerator(),
 *     $factory->getNumberConverter(),
 * ));
 *
 * $timestampFirstComb = $factory->uuid4();
 * ```
 *
 * @deprecated Please migrate to {@link https://uuid.ramsey.dev/en/stable/rfc4122/version7.html Version 7, Unix Epoch Time UUIDs}.
 *
 * @link https://web.archive.org/web/20240118030355/https://www.informit.com/articles/printerfriendly/25862 The Cost of GUIDs as Primary Keys
 *
 * @immutable
 */
class TimestampFirstCombCodec extends StringCodec
{
    /**
     * @return non-empty-string
     */
    public function encode(UuidInterface $uuid): string
    {
        /** @phpstan-ignore possiblyImpure.methodCall */
        $bytes = $this->swapBytes($uuid->getFields()->getBytes());

return sprintf(
            '%08s-%04s-%04s-%04s-%012s',
            bin2hex(substr($bytes, 0, 4)),
            bin2hex(substr($bytes, 4, 2)),
            bin2hex(substr($bytes, 6, 2)),
            bin2hex(substr($bytes, 8, 2)),
            bin2hex(substr($bytes, 10))
        );
    }

/**
     * @return non-empty-string
     */
    public function encodeBinary(UuidInterface $uuid): string
    {
        /** @phpstan-ignore-next-line PHPStan complains that this is not a non-empty-string. */
        return $this->swapBytes($uuid->getFields()->getBytes());
    }

/**
     * @throws InvalidUuidStringException
     *
     * @inheritDoc
     */
    public function decode(string $encodedUuid): UuidInterface
    {
        /** @phpstan-ignore possiblyImpure.methodCall */
        $bytes = $this->getBytes($encodedUuid);

/** @phpstan-ignore possiblyImpure.methodCall */
        return $this->getBuilder()->build($this, $this->swapBytes($bytes));
    }

public function decodeBytes(string $bytes): UuidInterface
    {
        /** @phpstan-ignore possiblyImpure.methodCall */
        return $this->getBuilder()->build($this, $this->swapBytes($bytes));
    }

/**
     * Swaps bytes according to the timestamp-first COMB rules
     *
     * @pure
     */
    private function swapBytes(string $bytes): string
    {
        $first48Bits = substr($bytes, 0, 6);
        $last48Bits = substr($bytes, -6);

return substr_replace(substr_replace($bytes, $last48Bits, 0, 6), $first48Bits, -6);
    }
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	pluszzsu/pluszzsu	0775	2025-06-25 04:20:11
..	dir	-	pluszzsu/pluszzsu	0775	2025-06-25 04:20:11
CodecInterface.php	text/x-php	1.96 KB	pluszzsu/pluszzsu	0664	2025-06-25 04:20:11
GuidStringCodec.php	text/x-php	2.05 KB	pluszzsu/pluszzsu	0664	2025-06-25 04:20:11
OrderedTimeCodec.php	text/x-php	3.54 KB	pluszzsu/pluszzsu	0664	2025-06-25 04:20:11
StringCodec.php	text/x-php	3.12 KB	pluszzsu/pluszzsu	0664	2025-06-25 04:20:11
TimestampFirstCombCodec.php	text/x-php	3.28 KB	pluszzsu/pluszzsu	0664	2025-06-25 04:20:11
TimestampLastCombCodec.php	text/x-php	1.51 KB	pluszzsu/pluszzsu	0664	2025-06-25 04:20:11

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