PHP

$_SERVER['HTTP_REFERER']

The $_SERVER['HTTP_REFERER'] variable tells you from which webpage/site visitors to your pages came from by clicking a link.

Use as follows:

echo $_SERVER['HTTP_REFERER'];

If the visitor had entered your url onto their browser's address to get to a certain page on your site, then the $_SERVER['HTTP_REFERER'] variable will be empty.

Example:

We are using the $_SERVER['HTTP_REFERER'] on this page. If you came to this page from a link, you will see the referring page echoed below or empty if you came to this page directly through you browser's address bar as follows:



See also:

$_SERVER['HTTP_USER_AGENT']

$_SERVER['REMOTE_ADDR']

$_SERVER['PHP_SELF']

$_SERVER['REQUEST_URI']

$_SERVER['DOCUMENT_ROOT']

$_SERVER['HTTP_HOST']

$_SERVER['QUERY_STRING']

$_SERVER['SCRIPT_FILENAME']