1<?php 2 3declare(strict_types=1); 4 5namespace Sabre\DAV; 6 7/** 8 * UUID Utility. 9 * 10 * This class has static methods to generate and validate UUID's. 11 * UUIDs are used a decent amount within various *DAV standards, so it made 12 * sense to include it. 13 * 14 * @copyright Copyright (C) fruux GmbH (https://fruux.com/) 15 * @author Evert Pot (http://evertpot.com/) 16 * @license http://sabre.io/license/ Modified BSD License 17 */ 18class UUIDUtil 19{ 20 /** 21 * Returns a pseudo-random v4 UUID. 22 * 23 * This function is based on a comment by Andrew Moore on php.net 24 * 25 * @see http://www.php.net/manual/en/function.uniqid.php#94959 26 * 27 * @return string 28 */ 29 public static function getUUID() 30 { 31 return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x', 32 // 32 bits for "time_low" 33 mt_rand(0, 0xffff), mt_rand(0, 0xffff), 34 35 // 16 bits for "time_mid" 36 mt_rand(0, 0xffff), 37 38 // 16 bits for "time_hi_and_version", 39 // four most significant bits holds version number 4 40 mt_rand(0, 0x0fff) | 0x4000, 41 42 // 16 bits, 8 bits for "clk_seq_hi_res", 43 // 8 bits for "clk_seq_low", 44 // two most significant bits holds zero and one for variant DCE1.1 45 mt_rand(0, 0x3fff) | 0x8000, 46 47 // 48 bits for "node" 48 mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff) 49 ); 50 } 51 52 /** 53 * Checks if a string is a valid UUID. 54 * 55 * @param string $uuid 56 * 57 * @return bool 58 */ 59 public static function validateUUID($uuid) 60 { 61 return 0 !== preg_match( 62 '/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i', 63 $uuid 64 ); 65 } 66} 67