If all you want is a basic way to to hide the link code from the visitor and count the clicks it's as simple as something like:
yoursite.com/link.php?url=pornosite.org
link.php:
<?php
$url = $_GET['url'];
$file = $url;
$hit = file_get_contents ($file);
$hit = intval($hit) + 1;
file_put_contents($file, $hit);
header('Location: https://www.'.$url.'/affiliatecodestuff=123456');
?>
Obviously you can add to that with more security or logging, preventing the same IP registering more than once, etc.
__________________
__________________
|