gnu-social/lib/uuid.php

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<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* UUID generation
*
* PHP version 5
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category UUID
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET')) {
// This check helps protect against security problems;
// your code file can't be executed directly from the web.
exit(1);
}
/**
* UUID generation
*
* @category General
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
class UUID
{
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;
/**
* Constructor for a UUID
*
* Uses gen() to create a new UUID
*/
function __construct()
{
$this->str = self::gen();
}
/**
* For serializing to a string
*
* @return string version of self
*/
function __toString()
{
return $this->str;
}
/**
* For serializing to a string
*
* @return string version of self
*/
function getString()
{
return $this->str;
}
/**
* Generate a new UUID
*
* @return 36-char v4 (random-ish) UUID
*/
static function gen()
{
return sprintf('%s-%s-%04x-%04x-%s',
// 32 bits for "time_low"
common_random_hexstr(4),
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// 16 bits for "time_mid"
common_random_hexstr(2),
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// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 4
(hexdec(common_random_hexstr(2)) & 0x0fff) | 0x4000,
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// 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
(hexdec(common_random_hexstr(2)) & 0x3fff) | 0x8000,
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// 48 bits for "node"
common_random_hexstr(6));
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}
}