trying to track where my visitor comes from using php

$referal = mysql_real_escape_string($_SERVER['HTTP_REFERER']);

I would like to store this the first time the visitor comes to my site through a r开发者_运维百科eferer. so when this page is accessed again, the variable will not change.

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You can store it in a database combined with the IP-address of the visitor. Next time the visitor drops by, you check if the IP-address is known and if it does, just not add it again.

You could extend this by adding the time of the last visit and after a day or something you can add a new record for the visitor. This way you have a very simple visitor counter.

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Put it in the session:

$_SESSION['referrer'] = $_SERVER['HTTP_REFERER'];