index.php

<?php
//Start session
session_start();

unset($_SESSION['ID']);
unset($_SESSION['NAME']);
unset($_SESSION['COURSE']);
unset($_SESSION['YEAR']);
unset($_SESSION['STUD_ID']);
?>
<!DOCTYPE HTML>
<html lang="en-US">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Voting System</title>
    <link rel="stylesheet" href="assets/css/bootstrap.min.css">
    <link rel="stylesheet" href="assets/css/style_voter.css">
</head>
<body>

<!-- Header -->
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
    <div class="container">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="index.php">Voting Sytem</a>
        </div>

    </div><!-- /.container-fluid -->
</nav>
<!-- End Header -->


<div class="container">
    <div class="row">
        <div class="col-md-4 col-md-offset-4">
            <div class="login-con">
                <h3>Student Log-in</h3><hr>
                <?php
                if(isset($_SESSION['ERROR_MSG_ARRAY']) && is_array($_SESSION['ERROR_MSG_ARRAY']) && COUNT($_SESSION['ERROR_MSG_ARRAY']) > 0) {
                    foreach($_SESSION['ERROR_MSG_ARRAY'] as $msg) {
                        echo "<div class='alert alert-danger'>";
                        echo $msg;
                        echo "</div>";
                    }
                    unset($_SESSION['ERROR_MSG_ARRAY']);
                }
                ?>
                <form method="post" action="process/login.php" role="form">
                    <div class="form-group has-warning has-feedback">
                        <label for="stud_id">Student ID</label>
                        <input type="text" name="stud_id" id="stud_id" class="form-control" autocomplete="off">
                        <span class="glyphicon glyphicon-lock form-control-feedback"></span>
                    </div>
                        <button type="submit" name="submit" class="btn btn-info">Submit</button>
                </form>
            </div>
        </div>
    </div>
</div>


<!-- Footer -->
<nav class="navbar navbar-inverse navbar-fixed-bottom" role="navigation">

    <div class="container">
        <div class="navbar-text pull-left">
            Copyright 2018 @ Hajjar-Developer
        </div>
    </div>

</nav>
<!-- End Footer -->

<script src="assets/js/jquery.js"></script>
<script src="assets/js/bootstrap.min.js"></script>

</body>
</html>