-
-
<?php
-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', $uuid) === 1;
- }
-}
-
-// Usage
-// Named-based UUID.
-
-$v3uuid = UUID::v3('1546058f-5a25-4334-85ae-e68f2a44bbaf', 'SomeRandomString');
-$v5uuid = UUID::v5('1546058f-5a25-4334-85ae-e68f2a44bbaf', 'SomeRandomString');
-
-// Pseudo-random UUID
-
-$v4uuid = UUID::v4();
-?>
-
-
-
-
