Export ical format for Facebook page's events by cognitom. Modifications: pageId as parameter, restriction to public events, improved timezone adjustment, ignore exceptions

fb2ical.php

<?php
/*
	original code by cogitom: https://gist.github.com/997980/

	This script reads future events (plus several days into the past) from Facebook pages
	and creates a subscribable iCalendar

	Improvements upon the original version:
	- fixed start and endtime reading
	- timezone adjustment done on facebook's side (more reliable)
	- restrict to public events
	- more detailed location (include venue or link to facebook page, depending on what is available)
	- ignore exeptions (e.g. no events)
*/
// https://github.com/facebook/facebook-php-sdk
require_once 'path/to/facebook.php';
// http://www.kigkonsult.se/iCalcreator/
require_once 'path/to/iCalcreator.class.php';

$config = array(
	'appId' => 'xxxx',//change to your fb app id
	'secret' => 'yyyy',//change to your fb app secret
	'pageId' => $_GET['fbpage'],//get the pageid from passed parameter 'fbpage'
	'timezone' => 'Europe/Berlin',
	'timezoneDif' => 9*60*60,
);

$facebook = new Facebook(array('appId'=>$config['appId'], 'secret'=>$config['secret']));

$page = $facebook->api('/'.$config['pageId']);

$v = new vcalendar(array('unique_id'=>$config['pageId']));
$v->setProperty('method', 'PUBLISH' );
$v->setProperty('x-wr-calname', $page['name']);
$v->setProperty('X-WR-CALDESC', $page['name']);
$v->setProperty('X-WR-TIMEZONE', $config['timezone']);

try {
	$cons = $facebook->api('/'.$config['pageId'].'/events');
	$event_ids = array();

	//the times given here - unlike the ones retrieved from an event object -  are already adjusted to your local time.
	$start_times = array();
	$end_times = array();
	foreach ($cons['data'] as $con) {
		$event_ids[] = $con['id'];
		$start_times += array($con['id'] => preg_replace('/[-T:]/', '', $con['start_time']));
		$end_times += array($con['id'] => preg_replace('/[-T:]/', '', $con['end_time']));
	}

	$events = $facebook->api('?date_format=U&ids='.implode(',', $event_ids));

	foreach ($events as $event){
		//only add public events
		if ($event['privacy'] == "OPEN"){

			$etz = $config['timezone'];

			$e = & $v->newComponent('vevent');
			$e->setProperty('dtzid',$etz);
$e->setProperty('dtstart', $start_times[$event['id']]);
			$e->setProperty('dtend', $end_times[$event['id']]);
			$location = $event['location'];

			// include street address or link to facebook page in location
			if ($event['venue']){
			 	$venues = $event['venue'];
		 		$venue="";
			 	if (!$venues['id']){
			 		foreach ($venues as $vn) {
			 			$venue = $venue.", ".$vn;
			 		}
			 	} else {
			 		$getid = $facebook->api('/'.$venues['id']);
			 		$venue = " (".$getid['link'].")";
			 	}
			 	$location = $location." @ ".$venue;
			}
			$e->setProperty('location', $location);
			$e->setProperty('summary', $event['name']);
			$e->setProperty('description', $event['description']);
			$e->setProperty('url', 'http://www.facebook.com/event.php?eid='.$event['id']);
		}
	}
} catch (Exception $e) {
	//ignore Exeptions (e.g. if there are no events)
}
$v->returnCalendar();

Google said: We could not parse the calendar at the url requested.
Any ideas?

update: I think I figured, I enclosed $e->setProperty('dtend', $end_times[$event['id']]); into an if condition to avoid setting a blank DTEND if no end time is specified in event. I can't immediately check in google but joomla's jevent module at lest seems to chew it better now. I see it working now in google and joomla jevents. See my fork - https://gist.github.com/akostadinov/61694b39de9d4e024be9