<?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 */ 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 ) !== 0; } }