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<?php
/**
* UUID Utility
*
* This class has static methods to generate and validate UUID's.
* UUIDs are used a decent amount within various *DAV standards, so it made
* sense to include it.
*
* @package Sabre
* @subpackage DAV
* @copyright Copyright (C) 2007-2011 Rooftop Solutions. All rights reserved.
* @author Evert Pot (http://www.rooftopsolutions.nl/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class Sabre_DAV_UUIDUtil {
/**
* Returns a pseudo-random v4 UUID
*
* This function is based on a comment by Andrew Moore on php.net
*
* @see http://www.php.net/manual/en/function.uniqid.php#94959
* @return void
*/
static function getUUID() {
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 )
);
}
/**
* Checks if a string is a valid UUID.
*
* @param string $uuid
* @return bool
*/
static function validateUUID($uuid) {
return preg_match(
'/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i',
$uuid
) == true;
}
}
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