1<?php
2
3/**
4 *  BENNU - PHP iCalendar library
5 *  (c) 2005-2006 Ioannis Papaioannou (pj@moodle.org). All rights reserved.
6 *
7 *  Released under the LGPL.
8 *
9 *  See http://bennu.sourceforge.net/ for more information and downloads.
10 *
11 * @author Ioannis Papaioannou
12 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
13 */
14
15class Bennu {
16    static function timestamp_to_datetime($t = NULL) {
17        if($t === NULL) {
18            $t = time();
19        }
20        return gmstrftime('%Y%m%dT%H%M%SZ', $t);
21    }
22
23    static function timestamp_to_date($t = NULL) {
24        if ($t === NULL) {
25            $t = time();
26        }
27        return gmstrftime('%Y%m%d', $t);
28    }
29
30    static function generate_guid() {
31        // Implemented as per the Network Working Group draft on UUIDs and GUIDs
32
33        // These two octets get special treatment
34        $time_hi_and_version       = sprintf('%02x', (1 << 6) + mt_rand(0, 15)); // 0100 plus 4 random bits
35        $clock_seq_hi_and_reserved = sprintf('%02x', (1 << 7) + mt_rand(0, 63)); // 10 plus 6 random bits
36
37        // Need another 14 random octects
38        $pool = '';
39        for($i = 0; $i < 7; ++$i) {
40            $pool .= sprintf('%04x', mt_rand(0, 65535));
41        }
42
43        // time_low = 4 octets
44        $random  = substr($pool, 0, 8).'-';
45
46        // time_mid = 2 octets
47        $random .= substr($pool, 8, 4).'-';
48
49        // time_high_and_version = 2 octets
50        $random .= $time_hi_and_version.substr($pool, 12, 2).'-';
51
52        // clock_seq_high_and_reserved = 1 octet
53        $random .= $clock_seq_hi_and_reserved;
54
55        // clock_seq_low = 1 octet
56        $random .= substr($pool, 13, 2).'-';
57
58        // node = 6 octets
59        $random .= substr($pool, 14, 12);
60
61        return $random;
62    }
63}
64
65