[PHP] Referer parsing functions?

[Brian Dunning]

I've found a number of PHP classes for parsing server logs, but I just 
want to parse a single referer at a time. Anyone know of a class that 
will do this?

1) Extract just the site from the full referer string,
2) Extract the query keyword (if any) no matter what search engine the 
referer is from.

I may be asking too much, but one never knows unless one asks...  :)
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