<?php session_start(); $ref = $_SERVER['HTTP_REFERER'];

if(isset($_SESSION['username'])) {

    include('header.php');
    echo '<div class="error_message">Attention! You are already logged in.</div>';
    echo "<h2>What to do now?</h2><br />";
    echo "Go <a href='javascript:history.go(-1)'>back</a> to the page you were viewing before this.</li>";
    include('footer.php');

    exit();
}

// Has an error message been passed to login.php?
$error = $_GET['e'];

if($error == 1) {
    $error = '<div class="error_message">Attention! You must be logged in to view this page.</div>';
}

// Only process if the login form has been submitted.
die(var_dump($_POST, $_SESSION));
if(isset($_POST['login'])) {

    $username = $_POST['username'];
    $password = $_POST['password'];

    if (!isset($username) || !isset($password)) {
        header( "Location: home.php" ); exit();
    } elseif (empty($username) || empty($password)) {
        $error = '<div class="error_message">Attention! Please enter your Username and Password.</div>';
    } else {

    // Add slashes to the username and md5() the password
    $user = mysql_real_escape_string(addslashes($_POST['username']));
    $pass = mysql_real_escape_string(md5($_POST['password']));


    $sql = "SELECT * FROM login_users WHERE username='$user' AND password='$pass'";
    $result = mysql_query($sql);

    // Check that at least one row was returned
    $rowCheck = mysql_num_rows($result);

    if($rowCheck > 0) {
    while($row = mysql_fetch_array($result)) {

      // Start the session and register a variable

      session_start();
      $_SESSION['username'] = $user;
      //session_register('username');

      header("Location: ".$ref); exit();

      }

      } else {

      // If nothing is returned by the query, unsuccessful login code goes here...

      $error = '<div class="error_message">Attention! Incorrect username or password.</div>';
      }
    }
}

if(stristr($_SERVER['PHP_SELF'], 'admin')) { include('../header.php'); } else { include('header.php'); }

echo $error; ?>

<h2>Login</h2>

<form method="POST" action="">
<label>Username</label><input type="text" name="username" size="20">
<br />
<label>Password</label><input type="password" name="password" size="20">
<br />
<input type="submit" value="Submit" name="login">
</form>

<p><a href="forgotten.php">Forgotten Password?</a></p>

<p>Not registered yet? It's free, quick & easy to do so <a href="sign_up.php">here</a></p>

<?php if(stristr($_SERVER['PHP_SELF'], 'admin')) { include('../footer.php'); } else { include('footer.php'); } ?>