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   1  <?php
   2  
   3  /**
   4   *  BENNU - PHP iCalendar library
   5   *  (c) 2005-2006 Ioannis Papaioannou ([email protected]). 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 generate_guid() {
  24          // Implemented as per the Network Working Group draft on UUIDs and GUIDs
  25      
  26          // These two octets get special treatment
  27          $time_hi_and_version       = sprintf('%02x', (1 << 6) + mt_rand(0, 15)); // 0100 plus 4 random bits
  28          $clock_seq_hi_and_reserved = sprintf('%02x', (1 << 7) + mt_rand(0, 63)); // 10 plus 6 random bits
  29      
  30          // Need another 14 random octects
  31          $pool = '';
  32          for($i = 0; $i < 7; ++$i) {
  33              $pool .= sprintf('%04x', mt_rand(0, 65535));
  34          }
  35      
  36          // time_low = 4 octets
  37          $random  = substr($pool, 0, 8).'-';
  38      
  39          // time_mid = 2 octets
  40          $random .= substr($pool, 8, 4).'-';
  41      
  42          // time_high_and_version = 2 octets
  43          $random .= $time_hi_and_version.substr($pool, 12, 2).'-';
  44      
  45          // clock_seq_high_and_reserved = 1 octet
  46          $random .= $clock_seq_hi_and_reserved;
  47      
  48          // clock_seq_low = 1 octet
  49          $random .= substr($pool, 13, 2).'-';
  50      
  51          // node = 6 octets
  52          $random .= substr($pool, 14, 12);
  53      
  54          return $random;
  55      }
  56  }
  57