<?php
header ("Content-Type:text/xml");
$doc = new DOMDocument('1.0','UTF-8');
$doc->formatOutput = true;
$roomsXML=$doc->appendChild($doc->createElement("rooms"));
foreach($rooms as $room) 
        $roomsXML->appendChild($doc->createElement('room',$room['TYYPPI']));
echo $doc->saveXML();
?>