<?php
$ip = $_SERVER['REMOTE_ADDR'];
$hostaddress = gethostbyaddr($ip);
$browser = $_SERVER['HTTP_USER_AGENT'];

echo "<strong>Your IP address:</strong><br />\n";
echo "$ip<br /><br />";
echo "<strong>More detailed host address:</strong><br />\n";
echo "$hostaddress<br /><br />";
echo "<strong>Display browser info</strong>:<br />";
echo "$browser<br /><br />";

?>