Xây dựng Website PHP theo MVC

<?php

class Database
{
	public $conn = NULL;
	private $server = 'localhost';
	private $dbName = 'blog';
	private $user = 'root';
	private $password = '';
        
        // Hàm kết nối CSDL
	public function connect()
	{
		$this->conn = new mysqli($this->server, $this->user, $this->password, $this->dbName);

		if ($this->conn->connect_error) {
			printf($this->conn->connect_error);
			exit();
		}
		$this->conn->set_charset("utf8");
	}
        // Hàm đóng kết nối CSDL
        public function closeDatabase()
	{
		if ($this->conn) {
			$this->conn->close();
		}
	}
}

<?php
	require('Model/Database.php');
	$db = new Database;
	$db->connect();

	/*Xử lý các request*/


	$db->closeDatabase();