48 lines
1.7 KiB
PHP
48 lines
1.7 KiB
PHP
<?php
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/**
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* This file is part of the ramsey/uuid library
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*
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* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
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* @license http://opensource.org/licenses/MIT MIT
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* @link https://benramsey.com/projects/ramsey-uuid/ Documentation
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* @link https://packagist.org/packages/ramsey/uuid Packagist
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* @link https://github.com/ramsey/uuid GitHub
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*/
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namespace Ramsey\Uuid\Converter\Time;
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use Ramsey\Uuid\Converter\TimeConverterInterface;
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/**
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* PhpTimeConverter uses built-in PHP functions and standard math operations
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* available to the PHP programming language to provide facilities for
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* converting parts of time into representations that may be used in UUIDs
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*/
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class PhpTimeConverter implements TimeConverterInterface
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{
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/**
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* Uses the provided seconds and micro-seconds to calculate the time_low,
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* time_mid, and time_high fields used by RFC 4122 version 1 UUIDs
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*
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* @param string $seconds
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* @param string $microSeconds
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* @return string[] An array containing `low`, `mid`, and `high` keys
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* @link http://tools.ietf.org/html/rfc4122#section-4.2.2
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*/
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public function calculateTime($seconds, $microSeconds)
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{
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// 0x01b21dd213814000 is the number of 100-ns intervals between the
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// UUID epoch 1582-10-15 00:00:00 and the Unix epoch 1970-01-01 00:00:00.
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$uuidTime = ($seconds * 10000000) + ($microSeconds * 10) + 0x01b21dd213814000;
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return array(
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'low' => sprintf('%08x', $uuidTime & 0xffffffff),
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'mid' => sprintf('%04x', ($uuidTime >> 32) & 0xffff),
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'hi' => sprintf('%04x', ($uuidTime >> 48) & 0x0fff),
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);
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}
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}
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