<?php
/**
 * $calname
 *   The name of the calendar.
 * $site_timezone
 *   The name of the site timezone.
 * $events
 *   An array with the following information about each event:
 *
 *   $event['uid'] - a unique id for the event (usually the url).
 *   $event['summary'] - the name of the event.
 *   $event['start'] - the formatted start date of the event.
 *   $event['end'] - the formatted end date of the event.
 *   $event['rrule'] - the RRULE of the event, if any.
 *   $event['timezone'] - the formatted timezone name of the event, if any.
 *   $event['url'] - the url for the event.
 *   $event['location'] - the name of the event location.
 *   $event['description'] - a description of the event.
 *
 *   Note that there are empty spaces after RRULE, URL, LOCATION, etc
 *   that are needed to make sure we get the required line break.
 *
 */

?>
BEGIN:VCALENDAR
VERSION:2.0
METHOD:PUBLISH
X-WR-CALNAME: <?php print $calname . "\r\n"; ?>
PRODID:-//Drupal iCal API//EN
<?php foreach($events as $event): ?>
BEGIN:VEVENT
UID:<?php print($event['uid'] . "\r\n") ?>
SUMMARY:<?php print($event['summary'] . "\r\n") ?>
DTSTAMP:<?php print($current_date . "Z\r\n") ?>
DTSTART:<?php print($event['start'] . "Z\r\n") ?>
<?php if (!empty($event['end'])): ?>
DTEND:<?php print($event['end'] . "Z\r\n") ?>
<?php endif; ?>
<?php if (!empty($event['rrule'])) : ?>
<?php print($event['rrule'] . "\r\n") ?>
<?php endif; ?>
<?php if (!empty($event['url'])): ?>
URL;VALUE=URI:<?php print($event['url'] . "\r\n") ?>
<?php endif; ?>
<?php if (!empty($event['location'])): ?>
LOCATION:<?php print($event['location'] . "\r\n") ?>
<?php endif; ?>
<?php if (!empty($event['description'])) : ?>
DESCRIPTION:<?php print($event['description'] . "\r\n") ?>
<?php endif; ?>
END:VEVENT
<?php endforeach; ?>
END:VCALENDAR