Login Form

<?php
session_start();
include 'config.php';

if (isset($_SESSION['user']['username'])) {
    header('Location: ' . SITE_URL);
}
ini_set('display_errors',0);
include_once 'config.php';

$page_title = "Login";

include 'html_top.php';

?>
<div class='container'>
    <div class='row'>
        <div class='col-md-offset-4 col-md-4 col-md-offset-4'>
            <div class='panel panel-default'>
                <div class='panel-heading'><h2 class='panel-title'>Login</h2></div>
                <div class='panel-body'>
                    <form class='form-horizontal' method='post' action='authenticate.php'>
                        <div class='form-group'>
                            <label for='username' class='col-md-4 form-control-label'>Username</label>
                            <div class='col-md-8'>
                                <input type='text' name='username' class='form-control'>
                            </div>
                        </div>
                        <div class='form-group'>
                            <label for='password' class='col-md-4 form-control-label'>Password</label>
                            <div class='col-md-8'>
                                <input type='password' name='password' class='form-control'>
                            </div>
                        </div>
                        <div class='form-group'>
                            <div class='col-md-offset-4 col-md-8'>
                                <button type='submit' class='btn btn-primary'>
                                    Login
                                </button>
                            </div>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>

<?php

include 'html_bottom.php';