Help Convert This Link Extractor To Procedural Style Php

Hiya!

I just registered now.
Can someone be kind enough to convert this code to procedural style php and past it here so I can learn the code aswell as all other newbies ?
You see, I am still learning procedural style and have not gone to the oop level yet.
It is a Link Extractor.

<?php

//Code from: https://potentpages.com/web-crawler-development/tutorials/php/techniques

//Assuming your contents are in a variable called $contents
//New DOM Document
$document = new...

Code (markup):

Help Convert This Link Extractor To Procedural Style Php

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