how do you detect if your website visitor came from a google search result?

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Check the $_SERVER['HTTP_REFERER'] variable which should contain the referring URL. Please note that this is not tamper-proof or fail-safe as the Http-Referer header can easily been changed or modified by a client.

EDIT:
Just googled for phpinfo (because chanes were high that I get a phpinfo() page that shows the $_SERVER['HTTP_REFERER'] variable) to show you how the Http-Referer will look like:

$_SERVER['HTTP_REFERER'] = "http://www.google.de/search?hl=de&q=phpinfo&btnG=Google-Suche&meta="

As you see, you can also extract the search term used in the google query (or detect if the search was initiated by the Google Chrome address bar)…

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