Calendar event class for outputting an ics event file.

event

class CalendarEvent
{
    public $description;
	public $start;
	public $end;
	
	public function data()
	{
		$format = 'Ymd\THis';
	
		$lines = array();
		
		$lines[] = 'BEGIN:VCALENDAR';
		$lines[] = 'VERSION:2.0';
		$lines[] = 'PRODID://Wordpress//EN';
		$lines[] = 'BEGIN:VEVENT';
		$lines[] = 'UID:'.md5($this->start . $this->end . $this->description . time());
		$lines[] = 'DTSTART:'.date($format, $this->start);
		$lines[] = 'DTEND:'.date($format, $this->end);
		$lines[] = 'SUMMARY:'.$this->description;
		$lines[] = 'END:VEVENT';
		$lines[] = 'END:VCALENDAR';
		
		return implode("\r\n", $lines);
	}
	
	public function download()
	{
		$data = $this->data();
	
		header('Content-Disposition: attachment; filename="event.ics"');
		header("Cache-Control: no-cache, must-revalidate");
		header("Content-type:text/calendar");
		header('Content-Length: '.strlen($data));
		header('Connection: close');
		
		echo $data;
	}
}