yourip.php

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <title>Your IP address</title>
</head>
<body>
<h1>Your IP address is <?= $_SERVER['REMOTE_ADDR'] ?> </h1>
    <p>If this worked, then your web server has <code>short_open_tag</code>
  option enabled.</p>
    <p>If not, try <a href="yourip2.php">this version</a></p>
</body>
</html>