Login for Bryle Improved

<?php
session_start();

class login {
    private static $_instance = null;

    protected $MySQLi = null;

    public $Login;

    private function login($LoginData) {
        extract($LoginData);

        $this->Login = new stdClass();
        $this->Login->RESPONSE = false;
        $this->Login->MESSAGE = '';


        $this->initConnection($MySQL);
        $UserData = $this->_sanetizeArray($UserData);
        $this->initLogin($UserData);
    }

    public function getInstance($LoginData) {
        if(is_null(login::$_instance)) {
            login::$_instance = new login($LoginData);
        }

        return login::$_instance;
    }

    protected function initLogin($UserData) {
        extract($UserData);

        $inputCheck = $this->_inputCheck($Username, $Password);
        if($inputCheck == false) {
            $userCheck = $this->_userCheck($Username, $Password);
            if($userCheck == true) {
                if($Remember != false) {
                    setcookie('name', $Username, time() + 3600); // 3600 = 1hr
                } else {
                    $_SESSION['name'] = $Username;
                }

                $this->Login->MESSAGE = 'You have successfully been logged in.';
                $this->Login->RESPONSE = true;
            } else {
                $this->Login->MESSAGE = 'The username or password is incorrect.';
            }
        } else {
            $this->Login->MESSAGE = 'Do not leave any of the fields empty.';
        }
    }

    protected function initConnection($MySQL) {
        extract($MySQL);

        $this->MySQLi = new mysqli($Hostname, $Username, $Password, $Database);
        if($this->MySQLi != true) {
            exit('Was unable to establish a connection: ' . $this->MySQLi->connect_error);
        }
    }

    private function _userCheck($Username, $Password) {
        $query = $this->MySQLi->query("SELECT * FROM meh_users WHERE Username = '{$Username}' AND Password = '{$Password}' LIMIT 1");
        return ($query->num_rows > 0) ? true : false;
    }

    private function _inputCheck($Username, $Password) {
        if(strlen($Username) == 0 || strlen($Password) == 0) {
            return false;
        }

        return true;
    }

    private function _sanetizeArray($variable) {
        $variable = filter_input_array(INPUT_POST, $variable);
        return $variable;
    }
}

if(count($_POST) > 0) {
    $login = login::getInstance(array(
        'MySQL' => array(
            'Hostname' => '127.0.0.1',
            'Username' => 'root',
            'Password' => 'faq',
            'Database' => 'mrealms'
        ),
        'UserData' => array(
            'Username' => $_POST['name'],
            'Password' => $_POST['pwd'],
            'Remember' => (isset($_POST['remember']) ? $_POST['remember'] : false)
        )
    ));

    echo  $login->Login->MESSAGE;
    if($login->Login->RESPONSE != false) {
        header('Refresh: 2.5;Url=index.php');
    }
}
?>