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