Need help on how to use this script.

I just ordered a book on Sitepoint for PHP/MySQL. I'm not lazy, I just don't understand PHP scripting.

I downloaded this script to mask affiliate codes and I sort of understand it. I was hoping some of you could give me - a N00B - more concrete examples of applying this script.

Save this page as jump.php and when linking to this script use the following:
    <a href="jump.php?m=XXXXXX">XXXXXX</a> 
Where XXXXXX is your merchant. 
*/
$m = $_GET['m'];
if ($m == "") {$link = "http://www.stevedawson.com/mobiles/";} // Default Blank
if ($m == "Just Phones") {$link = "http://www.awin1.com/awclick.php?mid=97&id=38362";}
if ($m == "UKPhoneShop") {$link = "http://tracker.tradedoubler.com/click?p=985&a=949731&g=5119";}

/*
To add more jump links, just copy and paste one of
the lines above and modify the $m and $link values
*/

header("Location: $link"); // Jump to the hiddden affiliate URL above
exit();
?>

Code (markup):

 

This is another way to hide URLS.

For example, if I click on

jump.php?m=UKPhoneShop

It will take me to

http://tracker.tradedoubler.com/click?p=985&a=949731&g=5119

Peace,

 

I think I got it....

Thanks....