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if (array_key_exists("newuser", $_POST))
    {
        registerNewUser($_POST["username"], $_POST["password"]);
    }
    else
    {
        loginUser($_POST["username"], $_POST["password"]);
    }

    function registerNewUser($user, $pass)
    {
        global $conn;

        $cmd = "SELECT * FROM `simpleuser` WHERE `username` = '$user'";
        $result = $conn->prepare($cmd);
        $result->execute();

        if ($result->rowCount() > 0)
        {
            displayMessage("That username already exists.");
        }
        else
        {
            $cmd = "INSERT INTO `simpleuser` VALUES ('$user', '$pass')";
            echo $cmd."<br />";
            $result = $conn->prepare($cmd);
            $result->execute();
            displayMessage("User successfully added.");
        }
    }

    function loginUser($user, $pass)
    {
        global $conn;

        $cmd = "SELECT `password` FROM `simpleuser` WHERE `username` = '$user'";
        $result = $conn->prepare($cmd);
        $result->execute();

        if ($result->rowCount() == 0)
        {
            displayMessage("Username or password is incorrect");
        }
        else
        {
            $data = $result->fetch();
            if ($data["password"] == $pass)
            {
                displayMessage("Welcome back, $user!");
            }
            else
            {
                displayMessage("Username or password is incorrect");
            }
        }
    }

    function displayMessage($msg)
    {
        echo "$msg<br/>";
        echo "<a href = 'index.php' >Go Home</a>";
    }
?>
<html>
    <head>
        <title></title>
        <style>
            input
            {
                margin: 10px 10px;
            }
        </style>
        <script>
            function initialize()
            {

            }
        </script>
    </head>
    <body onload = "initialize();">
        <form method = "post" action = "register.php">
            Username: <input type = "text" name = "username"/>
            Password: <input type = "text" name = "password"/>
            New User? <input type = "checkbox" name = "newuser" />
            <input type = "submit" value = "Login"/>
        </form>
    </body>
</html>