how to change links with one click

does anyone know how to use access php


<?php
$link = $_GET['q'];
header('Location: http://clocksky.link/jojo?q=@keyword&affiliate_id='.$link);
?>

I have read what you posted several times, change this with what honestly? I do not see anything which happens here. I am not sure I understand this code cause it catches some param but it really do not work with it absolutely.