public function xmlTransform($xsl,$xml,$postArray) {
$style = new DOMDocument;
$style->load('data/'.$xsl.'.xsl');
$source = new DOMDocument;
$source->load('data/'.$xml.'.xml');
$proc = new XSLTProcessor();
$proc->registerPHPFunctions();
$proc->importStylesheet($style);
$transformData = array($proc,$source);
foreach ($postArray as $key => $value) {
$transformData[0]->setParameter('',$key,$value);
}
return $transformData[0]->transformToXML($transformData[1]);
}

I can extract an html form using this getForm function which calls
xmlTransform function:

public function getForm($param) {
$paramArray = explode(' ',$param);
if ($_POST['runon'] == 'end') {
if (self::checkValid()) return
"<p><strong>".self::sendMail()."</strong></p>\r";
else return self::getXMLData('xmlData')->emailFail;
}
else {
if (!$form = $_POST['runon']) $form = $paramArray[0];
$code = self::keyCode();
$postArray = array();
if ($_POST) $postArray = $_POST['mail'];
$postArray['destination'] = $paramArray[1].".php";
$postArray['cipher'] = $code[0];
$postArray['code'] = $code[1];
$postArray['timestamp'] = time();
}
return self::xmlTransform('form',$form,$postArray);
}