Server Variables in PHP to find the Referrer,Browser&IP Address

Coding:

<?php
$referrer = $_SERVER['HTTP_REFERER'];
$browser = $_SERVER['HTTP_USER_AGENT'];
$ipAddress = $_SERVER['REMOTE_ADDR'];

print "Referrer = " . $referrer . "<BR>";
print "Browser = " . $browser . "<BR>";
print "IP Adress = " . $ipAddress;
?>

In the above coding is usefull to find out which browser the user is to be working 

on&which ip address&which referrer (i.ein which domin&folder the user is working).

Try this Script.