MAth-Cloud-3.0.0/api.ipsocloud.com/api/v1/Tools/UUID.class.php

<?php

namespace Tools {
  /**
   * Usage
   * 
   * Named-based UUID
   * $v3uuid = UUID::v3('1546058f-5a25-4334-85ae-e68f2a44bbaf', 'SomeRandomString');
   * $v5uuid = UUID::v5('1546058f-5a25-4334-85ae-e68f2a44bbaf', 'SomeRandomString');
   * 
   * Pseudo-random UUID
   * $v4uuid = UUID::v4();
   */
  class UUID {
  public static function v3($namespace, $name) {
  if(!self::is_valid($namespace)) return false;

  // Get hexadecimal components of namespace
  $nhex = str_replace(array('-','{','}'), '', $namespace);

  // Binary Value
  $nstr = '';

  // Convert Namespace UUID to bits
  for($i = 0; $i < strlen($nhex); $i+=2) {
  $nstr .= chr(hexdec($nhex[$i].$nhex[$i+1]));
  }

  // Calculate hash value
  $hash = md5($nstr . $name);

  return sprintf('%08s-%04s-%04x-%04x-%12s',

  // 32 bits for "time_low"
  substr($hash, 0, 8),

  // 16 bits for "time_mid"
  substr($hash, 8, 4),

  // 16 bits for "time_hi_and_version",
  // four most significant bits holds version number 3
  (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x3000,

  // 16 bits, 8 bits for "clk_seq_hi_res",
  // 8 bits for "clk_seq_low",
  // two most significant bits holds zero and one for variant DCE1.1
  (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,

  // 48 bits for "node"
  substr($hash, 20, 12)
  );
  }

  public static function v4() {
  return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',

  // 32 bits for "time_low"
  mt_rand(0, 0xffff), mt_rand(0, 0xffff),

  // 16 bits for "time_mid"
  mt_rand(0, 0xffff),

  // 16 bits for "time_hi_and_version",
  // four most significant bits holds version number 4
  mt_rand(0, 0x0fff) | 0x4000,

  // 16 bits, 8 bits for "clk_seq_hi_res",
  // 8 bits for "clk_seq_low",
  // two most significant bits holds zero and one for variant DCE1.1
  mt_rand(0, 0x3fff) | 0x8000,

  // 48 bits for "node"
  mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
  );
  }

  public static function v5($namespace, $name) {
  if(!self::is_valid($namespace)) return false;

  // Get hexadecimal components of namespace
  $nhex = str_replace(array('-','{','}'), '', $namespace);

  // Binary Value
  $nstr = '';

  // Convert Namespace UUID to bits
  for($i = 0; $i < strlen($nhex); $i+=2) {
  $nstr .= chr(hexdec($nhex[$i].$nhex[$i+1]));
  }

  // Calculate hash value
  $hash = sha1($nstr . $name);

  return sprintf('%08s-%04s-%04x-%04x-%12s',

  // 32 bits for "time_low"
  substr($hash, 0, 8),

  // 16 bits for "time_mid"
  substr($hash, 8, 4),

  // 16 bits for "time_hi_and_version",
  // four most significant bits holds version number 5
  (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x5000,

  // 16 bits, 8 bits for "clk_seq_hi_res",
  // 8 bits for "clk_seq_low",
  // two most significant bits holds zero and one for variant DCE1.1
  (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,

  // 48 bits for "node"
  substr($hash, 20, 12)
  );
  }

  public static function is_valid($uuid) {
  return preg_match('/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?'.
            '[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i', $uuid) === 1;
  }
  }
}
?>