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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?
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get_previous_posts_link( string $label = null ) Retrieves the previous posts page link.
$_SERVER['HTTP_HOST'] Returns the Host header from the current request. $_SERVER['HTTP_REFERER'] Returns the complete URL of the current page (not reliable because not all user-agents support it)
How Redirection Works in PHP. In PHP, when you want to redirect a user from one page to another page, you need to use the header() function. The header function allows you to send a raw HTTP location header, which performs the actual redirection as we discussed in the previous section.
Use the $_SERVER['HTTP_REFERER'] header, but bear in mind anybody can spoof it at anytime regardless of whether they clicked on a link.
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$_SERVER['HTTP_REFERER'] is the answer
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