Something

<?PHP
$start = microtime(true);

session_start();
include('db.php');


// am I logged in?

if (!isset($_SESSION['email']))
       header("Location: login.php?error=You are not logged in.");	

$email = $_SESSION['email'];
$first_name = $_SESSION['first_name'];



?>
You are logged in <?php echo $_SESSION['first_name']; ?>!