<?php
header ("Content-Type:text/xml");
	$doc = new DOMDocument('1.0','UTF-8');
	$doc->formatOutput = true;
	$courses=$doc->appendChild($doc->createElement('courses'));
	$previous=$courses->appendChild($doc->createElement('previous'));
	$following=$courses->appendChild($doc->createElement('following'));
	if (!empty($bookings))
	{
		foreach($bookings as $stamp=>$booking) {
			if ($stamp<$time){
				$course=$previous->appendChild($doc->createElement('course'));
				$course->appendChild($doc->createElement('group',implode(',',$booking['group'])));
				$course->appendChild($doc->createElement('courseId',implode(',',$booking['course'])));
				$course->appendChild($doc->createElement('title',$booking['title']));
				$course->appendChild($doc->createElement('teacher',$booking['teacher']));
				$course->appendChild($doc->createElement('starttime',$booking['starttime']));
				$course->appendChild($doc->createElement('endtime',$booking['endtime']));
				$course->appendChild($doc->createElement('duration',$booking['duration']));
			}
			else {
				$course=$following->appendChild($doc->createElement('course'));
				$course->appendChild($doc->createElement('group',implode(',',$booking['group'])));
				$course->appendChild($doc->createElement('courseId',implode(',',$booking['course'])));
				$course->appendChild($doc->createElement('title',$booking['title']));
				$course->appendChild($doc->createElement('teacher',$booking['teacher']));
				$course->appendChild($doc->createElement('starttime',$booking['starttime']));
				$course->appendChild($doc->createElement('endtime',$booking['endtime']));
				$course->appendChild($doc->createElement('duration',$booking['duration']));
				
			}
		}
	}
	echo $doc->saveXML(); 
?>