I would like to take my referring URL and get any keywords that might have been used in a search engine to find my site. There is a lot of PHP scripts that can do this but they are often written once and never updated. Does anyone know of an open source PHP library that has this ability and is updated often? I am hoping that a function like this that is maintained by the open source community would be able to detect more keywords from more sources. The code should have less chance of becoming outdated as well. Thanks for any help.
It's not exactly a library, but it provides a simple example of what you're looking to do for about 25 engines. http://www.phpbb.com/community/viewtopic.php?t=784615