UUIDUtil.php
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UUIDUtil.php
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	<?php

	namespace Sabre\DAV;

	/**
	* 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) 2007-2015 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;

	}

	}