rss-ics.php

<?php
# Read an RSS feed and generate an ical calendar with the feed items as events.
#
# Written by Tom Henderson, 31 May 2007
# 
# Use however you like, but please attribute my code to me.
# If you come up with anything cool I'd love to hear about it.
#
# Usage:
# http://path/to/rss-ics.php?url=http://path/to/feed/

# MagpieRSS files
require_once('../tools/magpierss-0.72/rss_fetch.inc');
require_once('../tools/magpierss-0.72/rss_utils.inc');

# Calendar properties
$xwrcalname = "RSScal"; # Default name for the calendar
$prodid = "-//Generated by RSScal//Tom Henderson 2007";
$duration = 60 * 60 * 3; # Duration for the events (10,800 seconds == 3 hours)

# Querystring options
$url = $_GET['url']; # Feed URL

$rss = fetch_rss($url);

if ( $rss ) {
    # Debug
    #print_r($rss);
    
    # Update the calendar name from the feed data
    $xwrcalname = $rss->channel['title'];
    $events = "";
    
    # Loop through the feed items and format an event for each
    foreach ( $rss->items as $item ) {
        $title = $item['title'];
        $description = $item['description'];
        $description = ""; # Ignore description for now.

        if ( $item['pubdate'] == '' ) {
            # Get the date using the dc:date field
            # Handy code by Chrys Bader: http://www.php.net/manual/en/function.strtotime.php#74495
            $rfc3339 = $item['dc']['date']; # Date is in RFC3339 format
            
            $tmp = str_replace( "T", " ", $rfc3339 ); # Remove the T
            $tmp = ereg_replace( "(\.[0-9]{1,})?", "", $tmp ); # Remove the decimal and any numbers after it

            $datetime = substr($tmp, 0, 19);  # Grab the datetime
            $timezone = str_replace( ":", "", substr($tmp, 19, 6) ); # Grab the timezone
            
            $pubdate = strtotime( $datetime . " " . $timezone );
            # Thanks Chris
        } else {
            # Get the date with the pubdate field
            $pubdate = strtotime( $item['pubdate'] );
        }
        
        $dtstart = date( 'Ymd\THis',  $pubdate );
        $dtend =   date( 'Ymd\THis',  ( $pubdate + $duration ) );
        $url = $item[link];

        $events .= "BEGIN:VEVENT\n";
        $events .= "URL;VALUE=URI:$url\n";
        $events .= "DTSTART:$dtstart\n";
        $events .= "DTEND:$dtend\n";
        $events .= "SUMMARY:$title\n";
        $events .= "DESCRIPTION:$description\n";
        $events .= "END:VEVENT\n";
    }
    
} else {
    # The calendar must have 1 event
    # Make one for now containing the error message
    
    $pubdate = strtotime( "Now" );
    $today = date( 'Ymd',  $pubdate );
        
    $events  = "BEGIN:VEVENT\n";
    $events .= "URL;VALUE=URI:http://www.blogtender.com/\n";
    $events .= "DTSTART:" . $today . "T120000\n";
    $events .= "DTEND:" . $today . "T163000\n";
    $events .= "SUMMARY:" . magpie_error() . "\n";
    $events .= "END:VEVENT\n";
}

?>
BEGIN:VCALENDAR
VERSION:2.0
X-WR-CALNAME:<?php echo $xwrcalname . "\n"; ?>
PRODID:<?php echo $prodid . "\n"; ?>
CALSCALE:GREGORIAN
METHOD:PUBLISH
<?php echo $events; ?>
END:VCALENDAR

Could it be updated to work with future versions of php ?

Probably. I've not used this code in about 9 years though! What's not working?