6 * This class has static methods to generate and validate UUID's.
7 * UUIDs are used a decent amount within various *DAV standards, so it made
12 * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
13 * @author Evert Pot (http://www.rooftopsolutions.nl/)
14 * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
16 class Sabre_DAV_UUIDUtil {
19 * Returns a pseudo-random v4 UUID
21 * This function is based on a comment by Andrew Moore on php.net
23 * @see http://www.php.net/manual/en/function.uniqid.php#94959
26 static function getUUID() {
28 return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
29 // 32 bits for "time_low"
30 mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),
32 // 16 bits for "time_mid"
35 // 16 bits for "time_hi_and_version",
36 // four most significant bits holds version number 4
37 mt_rand( 0, 0x0fff ) | 0x4000,
39 // 16 bits, 8 bits for "clk_seq_hi_res",
40 // 8 bits for "clk_seq_low",
41 // two most significant bits holds zero and one for variant DCE1.1
42 mt_rand( 0, 0x3fff ) | 0x8000,
45 mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
50 * Checks if a string is a valid UUID.
55 static function validateUUID($uuid) {
58 '/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i',