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65 lines
1.7 KiB
PHP
65 lines
1.7 KiB
PHP
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<?php
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namespace Sabre\DAV;
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/**
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* UUID Utility
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*
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* This class has static methods to generate and validate UUID's.
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* UUIDs are used a decent amount within various *DAV standards, so it made
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* sense to include it.
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*
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* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
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* @author Evert Pot (http://evertpot.com/)
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* @license http://sabre.io/license/ Modified BSD License
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*/
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class UUIDUtil {
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/**
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* Returns a pseudo-random v4 UUID
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*
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* This function is based on a comment by Andrew Moore on php.net
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*
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* @see http://www.php.net/manual/en/function.uniqid.php#94959
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* @return string
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*/
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static function getUUID() {
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return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
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// 32 bits for "time_low"
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mt_rand(0, 0xffff), mt_rand(0, 0xffff),
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// 16 bits for "time_mid"
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mt_rand(0, 0xffff),
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// 16 bits for "time_hi_and_version",
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// four most significant bits holds version number 4
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mt_rand(0, 0x0fff) | 0x4000,
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// 16 bits, 8 bits for "clk_seq_hi_res",
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// 8 bits for "clk_seq_low",
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// two most significant bits holds zero and one for variant DCE1.1
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mt_rand(0, 0x3fff) | 0x8000,
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// 48 bits for "node"
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mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
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);
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}
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/**
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* Checks if a string is a valid UUID.
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*
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* @param string $uuid
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* @return bool
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*/
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static function validateUUID($uuid) {
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return preg_match(
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'/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i',
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$uuid
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) !== 0;
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}
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}
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