Referring keyword display script

A little php script that will capture the keywords used by people who visit any pages on your website from Google (and any other search engine that uses q= as the keyword argument), and display them as an ordered list on your website. Only keywords used to access a particular page are returned, which means that you will only ever get relevant keywords listed on each page. The most popular keywords appear at the top of the list (although you could easily alter this if you wanted to list them the other way around), and each keyword links to its corresponding Google query. (These links have the nofollow attribute set to avoid Page Rank leakage, and also open in a new window.) Now updated to allow you to choose to display the keywords to everyone, or to show them only when people arrive from Google/other search engines.