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<?php
namespace Sabre\VObject;
/**
* 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.
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
class 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 string
*/
public 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 $uuid
*
* @return bool
*/
public static function validateUUID($uuid)
{
return 0 !== preg_match(
'/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i',
$uuid
);
}
}
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