for other elements, you just do the same:
foreach ($ls_ads as $ad) {
$ad_url = $ad->getAttribute('href');
print("AD URL : $ad_url");
$ad_Doc = new DOMDocument();
$ad_Doc->documentElement->appendChild($ad_Doc->importNode($ad));
$xpath = new DOMXPath($ad_Doc);
$img_src = $xpath->query("//img[@src]");
$title = $xpath->query("//div[@class='title']");
}