[thelist] Finding query string

Does anyone have any php code snippets that allows you to find the query
string the is located in the $http_referer variable?  Basically, I am
looking for something that will give me what the user searched for from
various search engines.

ie....
If someone came to me from
http://www.google.com/search?hl=en&lr=&ie=ISO-8859-1&q=php+games+site

I would like to know that they searched on "php games site".

Anyone have anything like that or can point me in the right direction?

Thanks

CDitty