<div class="loginForm">
        <form method="post">
            <p class="login_prompt">Login using your username and password.</p>
            <input type="text" name="username" placeholder="Username"><br /><br />

            <input type="password" name="password" placeholder="Password"><br />

            <label id="remembermeLabel">Remember me</label>
            <input type="checkbox" name="remembermecheck" value="remember"><br />

            <input type="submit" name="loginButton" value="Login" />
        </form>


        <?php

            session_start();

            require 'connectDB.php';

            if(!empty($_POST['username']) && !empty($_POST['password']))
            {
                $hashpassword = hash('sha512', $_POST['password']);

                $sql = 'SELECT userID, name, username FROM user WHERE username = "'.$_POST['username'].'" AND password =
                        "'.$hashpassword.'";';

                $result = $conn->query($sql);

                if(mysqli_num_rows($result) == 1)
                {
                    $row = $result->fetch_assoc();
                    $_SESSION['user_id'] = $row['userID'];
                    header("Location: index.php");
                }
                else
                {
                    $message = "Error";
                    echo "$message";
                }
            }
        ?>
    </div>