<?php
function checkvar($var){
return (!empty($var))?$var:"Unknown";
}
echo "<p>Referrer: " . checkvar($_SERVER['HTTP_REFERER']) . "</p>";
echo "<p>IP Address: " . checkvar($_SERVER['REMOTE_ADDR']) . "</p>";
echo "<p>Browser: " . checkvar($_SERVER['HTTP_USER_AGENT']) . "</p>";
?>
I think it is help full .