How to get content from a paragraph tag inside div via DOMDocument?

Question

How can I get paragraph tag inside a specific ID via DOMDocument()?

For example, the HTML is this:

<div id='content'>
xxx yyyy zzzz


fffuuu uuuueee
xxx yyyy pppppp zzzz

<p>i need only this line</p>
</div>

I just want to take P tag in content id DIV...

Note 1: I get whole content of the DIV with:

$doc = new DOMDocument();
@$doc->loadHTML($html);
$xpath = new DOMXPath($doc);
$newcontent = $xpath->query("//*[@id='content']");

Note 2: Don’t say getElementsByTagName; the HTML contains too many P tags.

Answer 1

I dare a getElementsByTagName :) - you dont need xpath at all :

$doc = new DOMDocument();
@$doc->loadHTML($html);
$p=$doc->getElementById('content')->getElementsByTagName('p')->item(0);
echo $p->nodeValue;

outputs

i need only this line