PHP Switch Issue

Hello y ' All I am relatively new to PHP, please forgive me for being stupid.

I'm currently working with the switch, and I was wondering how--if possible at all--to add the second variable to the same page. For example

I want to be able to my browser type is:

Php?scs=blah ">www.mysite.com/index.php?scs=blah

And got some parts of my site. Similarly, I would like to type:

Www.mysite.com/index.php?atp=blah

And get a different part.

I've set two variables, but the problem is I have a default setting for the first variable that needs to stay up late. The switch code is as follows

$scs = $_get[' SCS '];
@include (' pt1.php ');
Switch ($SCS) {
Default
@include (' vm9.php ');
Break
Case VSTR:
@include (' vst/v1.php ');
break; $ATP = $_get[' ATP '];
Switch ($ATP)
{Case credits: @include (' atp/credits.php '); break;

 function dosomething (x)
{
            if (x = = = "somestring")
    {         $ ("#item"). CSS (" Background-color "," Blue ");
$ ("Div.items"). Slideup ("fast");
        $ ("input[checkbox]:checked"). Hide ();
}
}