php_demo_01.php

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN">
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=iso-8859-1">
<title>PHP Example</title>
</head>
<body>
You are using <?php echo $_SERVER["HTTP_USER_AGENT"] ?><br />
You are located on <?php echo $_SERVER["REMOTE_ADDR"] ?>
</body>
</html>