public function createEventCalendar($start, $end, $description, $location)
{
    $event = array();
    $rand = rand(5, 1000000000);

    $event['name'] = "event";
    $event['data'] = "BEGIN:VCALENDARrnVERSION:2.0rnPRODID:-//TEST//TEST//ENrnBEGIN:VEVENTrnDTSTAMP:".date('YmdTHis')."rnSTATUS:CONFIRMEDrnUID:".$rand."rnDTSTART:".date('YmdTHis', strtotime($start))."rnDTEND:".date('YmdTHis', strtotime($end))."rnSUMMARY:BlablablarnDESCRIPTION:".$description."rnLOCATION:".$location."rnEND:VEVENTrnEND:VCALENDAR";

    return $event;
}

public function downloadEventCalendar($event)
{
    $eventname = $event['name'].'.ics';

    header("Content-Type: text/Calendar");
    header("Content-Disposition: attachment; filename="".$eventname.""");

    echo $event['data'];
    exit();
}