lib/bennu/bennu.class.php

   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
  15 class 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