Convert small asp script to php

Hi,

I am attempting to set up my first shopping cart system for my first web site using 1shoppingcart.com.  Unfortunately, I just found out my web hosting company does not support asp.  However, they do support php.  Is this a normal occurence of web hosting companies?

1shoppingcart.com gives the following asp script with the following directions so that their url does not show up in my customers browser, but my url will.  I was told by my web hosting company that the same results can be obtained with php.  So basically I just need a php script that will accomplish the same result as this asp script.  I'm not a programmer, so please keep your explanations on how I use your script simple.

Thank you.

(Is 1shoppingcart.com a reputable company and/or do you have any other suggestions for a shopping cart system?)
The following is the 1shoppingcart.com asp script:


<%@LANGUAGE="VBSCRIPT" CODEPAGE="1252"%>
<%
'// Command Script generated and powered by
'// 1ShoppingCart.com(c) 2003
'// http://www.1shoppingcart.com

dim merchantID,cmd,dest,baseurl

merchantID="67928"
cmd=Request("cmd")
baseurl="http://www.1shoppingcart.com"
dest=baseurl&"/app/default.asp?id="&merchantid

if request("productid")<>"" then
      if cmd="checkout" then
            dest=baseurl&"/app/javanof.asp?merchantid="&merchantID&"&"&request.querystring
      else
            dest=baseurl&"/app/netcart.asp?merchantid="&merchantID&"&"&request.querystring
      end if
elseif cmd<>"" then
      select case cmd
            case "cart"
                  dest=baseurl&"/app/netcart.asp?merchantid="&merchantid
            case "checkout"
                  dest=baseurl&"/app/javanof.asp?merchantid="&merchantid
            case "login"
                  dest=baseurl&"/app/aflogin.asp?merchantid="&merchantid
            case "signup"
                  dest=baseurl&"/app/afsignup.asp?merchantid="&merchantid
            case "cancel"
                  dest=baseurl&"/app/removesave.asp?merchantid="&merchantid&"&clientid="&request("id")&"&removear=Yes"
            case "update" 'change
                  dest=baseurl&"/app/r.asp?merchantid="&merchantid&"&id="&request("id")&"&c=1"
            case else 'home
                  dest="www.thebatteryshoppe.com"
      end select
else
      if request("af")<>"" then 'aftrack
            dest=baseurl&"/app/aftrack.asp?afid="&request("af")&"&u="&request("u")
      elseif request("ad")<>"" then 'adtrack
            dest=baseurl&"/app/adtrack.asp?adid="&request("ad")
      elseif request("email1")<>"" then 'contact
            dest=baseurl&"/app/contactsave.asp?merchantid="&merchantid
            if request.querystring<>"" then dest=dest & "&" & request.querystring
            if request.form<>"" then dest=dest & "&" & request.form
      end if
end if

response.redirect(dest)
response.end()
%>


Directions of 1shoppingcart.com for the use of their script above:

With 1ShoppingCart.com and our simple Command Script, your links, ads, and affiliate traffic will all be pointed to your domain, rather than to http://www.1shoppingcart.com. Just follow the easy instructions in this setup wizard!
If you would prefer not to use the Command Script, just click the Skip button at bottom to start creating shopping cart products immediately.
First, choose a script platform, then copy-paste all of the code from the text box into a simple text editor (Notepad or Textpad, etc).
Next, save the code as cmd.asp (ASP) to your local hard drive.
After you have saved the file, upload it to your website. ASP users, just save the file to any folder on your site - we recommend you put it in the root ("home") folder.
Now, enter the URL for your Command Script file here.
Example: http://www.mydomain.com/cmd.asp
Press  Save and Continue

Thats all the more directions I can provide at this time.  I was told that my web host company uses a Linux based system, but my web site consists of html, php, javascript, and sql.  I was told by my web hosting company that the same results as the asp script above can be obtained with php.  

I sincerely appreciate your help.

Steve
www.thebatteryshoppe.com