PHP SimpleXml - generate XML document

SimpleXml generate XML document from PHP:

$oXml = new SimpleXMLElement('<itemlist></itemlist>');
foreach($aItems as $aItem)
{
    $oXmlParameter = $oXml->addChild('item');
    $oXmlParameter->addChild('title', htmlentities($aItem['title']));
    $oXmlParameter->addChild('description', htmlentities($aItem['description']));
}
header('Content-type: text/xml');
echo $oXml->asXML();
exit;