I'm not an expert on ASP, but I think it's like this:
Request.QueryString("myVariable")
would be equivalent to
$myVariable
in PHP
When submitted through a form, the variables will take up their form names. In PHP, you don't need a function to read the value of a variable. I hope it helps a bit. 🙂 Another great site you might enjoy is http://www.asp-php.net 🙂