little page to return current ip and user agent

gistfile1.php

<?php

if ($_SERVER["HTTP_X_FORWARDED_FOR"] != "") {
  $IP = $_SERVER["HTTP_X_FORWARDED_FOR"]; 
  $host = @gethostbyaddr($_SERVER["HTTP_X_FORWARDED_FOR"]);
} else {
  $IP = $_SERVER["REMOTE_ADDR"];
  $host = @gethostbyaddr($_SERVER["REMOTE_ADDR"]);
}
header('Content-Type: application/json');
echo json_encode(array('ip' => $IP, 'host' => $host, 'userAgent' => $_SERVER["HTTP_USER_AGENT"]), JSON_PRETTY_PRINT);

?>