lib/magpierss/rss_utils.inc

   1 <?php
   2 /*
   3  * Project:     MagpieRSS: a simple RSS integration tool
   4  * File:        rss_utils.inc, utility methods for working with RSS
   5  * Author:      Kellan Elliott-McCrea <kellan@protest.net>
   6  * Version:     0.51
   7  * License:     GPL
   8  *
   9  * The lastest version of MagpieRSS can be obtained from:
  10  * http://magpierss.sourceforge.net
  11  *
  12  * For questions, help, comments, discussion, etc., please join the
  13  * Magpie mailing list:
  14  * magpierss-general@lists.sourceforge.net
  15  */
  16
  17
  18 /*======================================================================*\
  19     Function: parse_w3cdtf
  20     Purpose:  parse a W3CDTF date into unix epoch
  21
  22     NOTE: http://www.w3.org/TR/NOTE-datetime
  23 \*======================================================================*/
  24
  25 function parse_w3cdtf ( $date_str ) {
  26
  27     # regex to match wc3dtf
  28     $pat = "/(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})(:(\d{2}))?(?:([-+])(\d{2}):?(\d{2})|(Z))?/";
  29
  30     if ( preg_match( $pat, $date_str, $match ) ) {
  31         list( $year, $month, $day, $hours, $minutes, $seconds) =
  32             array( $match[1], $match[2], $match[3], $match[4], $match[5], $match[7]);
  33
  34         # calc epoch for current date assuming GMT
  35         $epoch = gmmktime( $hours, $minutes, $seconds, $month, $day, $year);
  36
  37         $offset = 0;
  38         if ( $match[11] == 'Z' ) {
  39             # zulu time, aka GMT
  40         }
  41         else {
  42             list( $tz_mod, $tz_hour, $tz_min ) =
  43                 array( $match[8], $match[9], $match[10]);
  44
  45             # zero out the variables
  46             if ( ! $tz_hour ) { $tz_hour = 0; }
  47             if ( ! $tz_min ) { $tz_min = 0; }
  48
  49             $offset_secs = (($tz_hour*60)+$tz_min)*60;
  50
  51             # is timezone ahead of GMT?  then subtract offset
  52             #
  53             if ( $tz_mod == '+' ) {
  54                 $offset_secs = $offset_secs * -1;
  55             }
  56
  57             $offset = $offset_secs;
  58         }
  59         $epoch = $epoch + $offset;
  60         return $epoch;
  61     }
  62     else {
  63         return -1;
  64     }
  65 }
  66
  67 ?>