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Suppose my site’s url is given as hyperlink on some page on the internet; that page could be anything on internet – blog, orkut, yahoo, even stackoverflow etc, and someone clicks on it,and visited my site. So can we know, using php, the previous url from which the visitor came to my page?
Use the
$_SERVER['HTTP_REFERER']header, but bear in mind anybody can spoof it at anytime regardless of whether they clicked on a link.