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   1  <?php
   2  /**
   3   * This file is part of the ramsey/uuid library
   4   *
   5   * For the full copyright and license information, please view the LICENSE
   6   * file that was distributed with this source code.
   7   *
   8   * @copyright Copyright (c) Ben Ramsey <[email protected]>
   9   * @license http://opensource.org/licenses/MIT MIT
  10   * @link https://benramsey.com/projects/ramsey-uuid/ Documentation
  11   * @link https://packagist.org/packages/ramsey/uuid Packagist
  12   * @link https://github.com/ramsey/uuid GitHub
  13   */
  14  
  15  namespace Ramsey\Uuid\Converter\Time;
  16  
  17  use Moontoast\Math\BigNumber;
  18  use Ramsey\Uuid\Converter\TimeConverterInterface;
  19  
  20  /**
  21   * BigNumberTimeConverter uses the moontoast/math library's `BigNumber` to
  22   * provide facilities for converting parts of time into representations that may
  23   * be used in UUIDs
  24   */
  25  class BigNumberTimeConverter implements TimeConverterInterface
  26  {
  27      /**
  28       * Uses the provided seconds and micro-seconds to calculate the time_low,
  29       * time_mid, and time_high fields used by RFC 4122 version 1 UUIDs
  30       *
  31       * @param string $seconds
  32       * @param string $microSeconds
  33       * @return string[] An array containing `low`, `mid`, and `high` keys
  34       * @link http://tools.ietf.org/html/rfc4122#section-4.2.2
  35       */
  36      public function calculateTime($seconds, $microSeconds)
  37      {
  38          $uuidTime = new BigNumber('0');
  39  
  40          $sec = new BigNumber($seconds);
  41          $sec->multiply('10000000');
  42  
  43          $usec = new BigNumber($microSeconds);
  44          $usec->multiply('10');
  45  
  46          $uuidTime
  47              ->add($sec)
  48              ->add($usec)
  49              ->add('122192928000000000');
  50  
  51          $uuidTimeHex = sprintf('%016s', $uuidTime->convertToBase(16));
  52  
  53          return [
  54              'low' => substr($uuidTimeHex, 8),
  55              'mid' => substr($uuidTimeHex, 4, 4),
  56              'hi' => substr($uuidTimeHex, 0, 4),
  57          ];
  58      }
  59  }