PHP DOMDocument Strings to Objects - php

Question

I have created a php script in PHP Dom where multiple html files are scraped to look for all P tags that contain a specific class.
I then want to get the values inside those p tags and build an unordered list in PHP Dom.
My problem is, while I can get the values and echo all of them onto a page, when I try to createElements and append each value in its own LI tag my results only returns the LAST item in the list. I hope that makes sense. Here is the code:
$dom = new DOMDocument();
$dom->formatOutput = true;
$dom->preservewhiteSpace = false;
//looping through an array
foreach ($pages as $page) {
foreach ($page['pageContent'] as $listlinks) {
$dom->loadHTMLFile($theurl . 'content_id_' . $listlinks['content'] . '.html');
//create the xPath object after loading the html source, otherwise the query won't work:/
$xPath = new DOMXPath($dom);
//get the p nodes in a DOMNodeList that has class"content_header_type_2":
$nodeList = $xPath->query("//p[#class='content_header_type_2']");
//create a new DOMDocument and add a ul element:
$newDom = new DOMDocument();
$ul = $newDom->createElement('ul');
$newDom->appendChild($ul);
// append all nodes from $nodeList to the new dom, as children of $ul:
foreach ($nodeList as $domElement) {
$domNode = $newDom->importNode($domElement, true);
echo $domNode->nodeValue . '<br>'; //This gives the entire list
$li = $newDom->createElement('li', $domNode->nodeValue); //This gives the last value in the list
$ul->appendChild($li);
}
}
};
$output = $newDom ->saveHTML();
echo $output;