inc/rss/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:             0.3
   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  * Mapgie 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
  32                 list( $year, $month, $day, $hours, $minutes, $seconds) =
  33                         array( $match[1], $match[2], $match[3], $match[4], $match[5], $match[6]);
  34
  35                 # calc epoch for current date assuming GMT
  36                 $epoch = gmmktime( $hours, $minutes, $seconds, $month, $day, $year);
  37
  38                 $offset = 0;
  39                 if ( $match[10] == 'Z' ) {
  40                         # zulu time, aka GMT
  41                 }
  42                 else {
  43                         list( $tz_mod, $tz_hour, $tz_min ) =
  44                                 array( $match[7], $match[8], $match[9]);
  45
  46                         # zero out the variables
  47                         if ( ! $tz_hour ) { $tz_hour = 0; }
  48                         if ( ! $tz_min ) { $tz_min = 0; }
  49
  50                         $offset_secs = (($tz_hour*60)+$tz_min)*60;
  51
  52                         # is timezone ahead of GMT?  then subtract offset
  53                         #
  54                         if ( $tz_mod == '+' ) {
  55                                 $offset_secs = $offset_secs * -1;
  56                         }
  57
  58                         $offset = $offset_secs;
  59                 }
  60
  61                 $epoch = $epoch + $offset;
  62                 return $epoch;
  63         }
  64         else {
  65                 return -1;
  66         }
  67 }
  68
  69 ?>