I do know ASP and it looks great 😉
Please beware, the original ASP coder used Request("some_var") which is the equivalent of using $_REQUEST['some_var'] in PHP. In other words a bad practice in both languages 😉
In ASP however, this can be extended to include sesson variables, server variables, and so on (very bad practice)...SO, please note that $_GET['some_var'] is the equivalent of Request.QueryString("some_var").
UPDATE.
Okay, now that I looked at the URL examples, it's clear to see that the script looks for GET variables. I did want to rant on about Request() so mission acomplished 😉