Get referring search phrase

[lapunluyang]

Is there a way to get the search phrase that was used on the search engine so it can be used in a php script?

I searched google, and didn't find anything. I think it has to be possible, because the statistic script is able to see how many hits have come from a specific keyword.

[Mersey]

Does this do what you want?
PHP: get keywords from search engine referer url - version 2