Here is some code to find out the referrer to a page in PHP. This can be very useful if you want to redirect back after login or something like that. You can also set it up to make sure a visitor came to the page from within your site or something like that.
<?php
session_start();
if(!isset($_SESSION[’referrer’])){
//get the referrer
if ($_SERVER[’HTTP_REFERER’]){
$referrer = $_SERVER[’HTTP_REFERER’];
}else{
$referrer = “unknown”;
}
//save it in a session
$_SESSION[’referrer’] = $referrer; // store session data
}
?>
Hope this is useful. The reference is: Get a referral URL from the session using PHP
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