111 lines
3.0 KiB
PHP
111 lines
3.0 KiB
PHP
<?php
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/**
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2010, StatusNet, Inc.
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*
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* UUID generation
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*
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* PHP version 5
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category UUID
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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if (!defined('STATUSNET')) {
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// This check helps protect against security problems;
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// your code file can't be executed directly from the web.
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exit(1);
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}
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/**
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* UUID generation
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*
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* @category General
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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class UUID
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{
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const REGEX = '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}';
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protected $str = null;
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/**
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* Constructor for a UUID
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*
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* Uses gen() to create a new UUID
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*/
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function __construct()
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{
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$this->str = self::gen();
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}
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/**
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* For serializing to a string
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*
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* @return string version of self
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*/
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function __toString()
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{
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return $this->str;
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}
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/**
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* For serializing to a string
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*
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* @return string version of self
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*/
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function getString()
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{
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return $this->str;
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}
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/**
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* Generate a new UUID
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*
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* @return 36-char v4 (random-ish) UUID
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*/
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static function gen()
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{
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return sprintf('%s-%s-%04x-%04x-%s',
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// 32 bits for "time_low"
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common_random_hexstr(4),
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// 16 bits for "time_mid"
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common_random_hexstr(2),
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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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(hexdec(common_random_hexstr(2)) & 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
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// for variant DCE1.1
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(hexdec(common_random_hexstr(2)) & 0x3fff) | 0x8000,
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// 48 bits for "node"
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common_random_hexstr(6));
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}
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}
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