How to get the value in div in php

I have a div in php (string) and I want to get the content.

For example: (Recommended learning: PHP video tutorial)

<div id="product_list" style="width:100%; float:none;">
      <div>
       bla bla bla      </div>
      bla bla          
</div>

And I want

<div>
     bla bla bla</div>
     bla bla

So this is the original html

$doc = new DOMDocument();
$doc->loadHTML($buffer);
$id = $doc->getElementById('product_list')

Using the php DomDocument class.

$dom = new DOMDocument();

$dom->loadHTML($html);

$xpath = new DOMXPath($dom);
$divContent = $xpath->query('//div[id="product_list"]');

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