lib/bennu/bennu.class.php

   1 <?php // $Id$
   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  * @version $Id$
  13  * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
  14  */
  15
  16 class Bennu {
  17     function timestamp_to_datetime($t = NULL) {
  18         if($t === NULL) {
  19             $t = time();
  20         }
  21         return gmstrftime('%Y%m%dT%H%M%SZ', $t);
  22     }
  23
  24     function generate_guid() {
  25         // Implemented as per the Network Working Group draft on UUIDs and GUIDs
  26
  27         // These two octets get special treatment
  28         $time_hi_and_version       = sprintf('%02x', (1 << 6) + mt_rand(0, 15)); // 0100 plus 4 random bits
  29         $clock_seq_hi_and_reserved = sprintf('%02x', (1 << 7) + mt_rand(0, 63)); // 10 plus 6 random bits
  30
  31         // Need another 14 random octects
  32         $pool = '';
  33         for($i = 0; $i < 7; ++$i) {
  34             $pool .= sprintf('%04x', mt_rand(0, 65535));
  35         }
  36
  37         // time_low = 4 octets
  38         $random  = substr($pool, 0, 8).'-';
  39
  40         // time_mid = 2 octets
  41         $random .= substr($pool, 8, 4).'-';
  42
  43         // time_high_and_version = 2 octets
  44         $random .= $time_hi_and_version.substr($pool, 12, 2).'-';
  45
  46         // clock_seq_high_and_reserved = 1 octet
  47         $random .= $clock_seq_hi_and_reserved;
  48
  49         // clock_seq_low = 1 octet
  50         $random .= substr($pool, 13, 2).'-';
  51
  52         // node = 6 octets
  53         $random .= substr($pool, 14, 12);
  54
  55         return $random;
  56     }
  57 }
  58
  59 ?>