/**
* Compares two event instances by start time
*
* @param EventInstance $a Instance
* @param EventInstance $b Instance
* @return int
*/
public static function compareInstancesByStartTime($a, $b)
{
$start_a = $a->getStartTimestamp();
$start_b = $b->getStartTimestamp();
if ($start_a == $start_b) {
return 0;
}
return $start_a < $start_b ? -1 : 1;
}
/**
* Returns an iCal feed for this event
*
* @param int $starttime Range start timestamp
* @param int $endtime Range end timestamp
* @param string $filename Filename used for output file
* @return string
*/
public function toIcal($starttime = null, $endtime = null, $filename = 'event.ics')
{
if (is_null($starttime)) {
$starttime = $this->getNextOccurrence();
}
$eventInstance = new EventInstance($this, $starttime);
//$this->getAllEventInstances($starttime, $endtime, true, 'ical');
$instance = $eventInstance->export('ical');
$config = array('unique_id' => $this->guid, 'allowEmpty' => true, 'nl' => "\r\n", 'format' => 'iCal', 'delimiter' => DIRECTORY_SEPARATOR, 'filename' => $filename);
$v = new vcalendar($config);
$v->setProperty('method', 'PUBLISH');
$v->setProperty("X-WR-CALNAME", implode(' - ', array(elgg_get_config('sitename'), $this->getDisplayName())));
$v->setProperty("X-WR-CALDESC", strip_tags($this->description));
$v->setProperty("X-WR-TIMEZONE", Util::UTC);
$e =& $v->newComponent('vevent');
$organizer = elgg_extract('organizer', $instance, array());
unset($instance['organizer']);
$reminders = elgg_extract('reminders', $instance, array());
unset($instance['reminders']);
foreach ($instance as $property => $value) {
$e->setProperty($property, $value);
}
if (!empty($organizer)) {
if (is_email_address($organizer)) {
$e->setProperty('organizer', $organizer);
} else {
$e->setProperty('organizer', elgg_get_site_entity()->email, array('CN' => $organizer));
}
}
if (!empty($reminders)) {
foreach ($reminders as $reminder) {
$a =& $e->newComponent('valarm');
$a->setProperty('action', 'DISPLAY');
$a->setProperty('trigger', "-PT{$reminder}S");
}
}
$v->returnCalendar();
}