Parsing search strings from referer urls?

First time post, please be gentle. I'd like to be able to extract search strings from referer urls that come from search engines. (via php, of course) For example, http://www.google.com/search?q=foo+bar&ie=UTF-8&oe=UTF-8 Now, I realize one might employ grep to pull out this information and its easy for a human to examine a url like the one above, but I'd like to programmatically present a nice, tidy list of search words used to generate the url. My gut says that one would need to write a function for each major search engine to parse out this information since each engine is unique in how it builds the url. However, I thought after poring over the manual and online docs/list and not finding a solution, and before I went off and reinvented the wheel, I would float the question and see what you fine folks have to say about the subject. Thanks in advance for any insight. -- T.J. Mahaffey tj@tjmahaffey.com