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   1  <?php
   2  
   3  namespace Ramsey\Uuid;
   4  
   5  /**
   6   * Provides binary math utilities
   7   */
   8  class BinaryUtils
   9  {
  10      /**
  11       * Applies the RFC 4122 variant field to the `clock_seq_hi_and_reserved` field
  12       *
  13       * @param $clockSeqHi
  14       * @return int The high field of the clock sequence multiplexed with the variant
  15       * @link http://tools.ietf.org/html/rfc4122#section-4.1.1
  16       */
  17      public static function applyVariant($clockSeqHi)
  18      {
  19          // Set the variant to RFC 4122
  20          $clockSeqHi = $clockSeqHi & 0x3f;
  21          $clockSeqHi |= 0x80;
  22  
  23          return $clockSeqHi;
  24      }
  25  
  26      /**
  27       * Applies the RFC 4122 version number to the `time_hi_and_version` field
  28       *
  29       * @param string $timeHi
  30       * @param integer $version
  31       * @return int The high field of the timestamp multiplexed with the version number
  32       * @link http://tools.ietf.org/html/rfc4122#section-4.1.3
  33       */
  34      public static function applyVersion($timeHi, $version)
  35      {
  36          $timeHi = hexdec($timeHi) & 0x0fff;
  37          $timeHi |= $version << 12;
  38  
  39          return $timeHi;
  40      }
  41  }