Php Dom Document results error - php

Question

I would like to scrape some elements from html, but I am unable to scrape the data as I need.
html
<div class="opinions">
<ul>
<li>
<div class="imgcontainers">
<a href="domainname.com" title="title"> `<img width="160" src="image.jpg" />`
</a>
</div>
<p class="caption">
asdfad
<span>November 03, 2015 09:29 This is article title</span>
</p>
</li>
</ul>
</div>
$dom = new DOMDocument();
$classname = 'opinions';
$html = get_page($url);
#$dom->loadHTML($html);
$dom->preserveWhiteSpace = false;
$xpath = new DOMXPath($dom);
$articles = $xpath->query("//*[#class='" . $classname . "']");
$p = $articles->getElementsByTagName('a');
$div = $articles->getElementsByTagName('div');
foreach($p as $value){
$title = $value->getAttribute("href");
echo $title;
}
when I run this script I am getting this error "Call to undefined method DOMNodeList::getElementsByTagName()"
What I exactly need is, I need every href link and img src path (if there) and span text value of this . Please suggest your advice how to achieve this.

Answer 1

Maybe you can learn something from my code
Or, if you decide to include my function, here is how I do it:
$html = ""; //your html
$props = array(
array("tagname"=>"div", "props"=>array("class"=>"opinions")),
//the '/' before 'a' is for all descendant <a> of <div>
array("tagname"=>"/a"),
);
$options = array("property"=>"href");
require_once 'getNodeValue.php';
$hrefs = getNodeValue($html, $props, $options);
print_r($hrefs);