Próbuje zrobić logowanie do systemu z wykorzystaniem OOP.
Proszę o opinie czy to co robie ma sens.

[PHP] pobierz, plaintext 
 define( "DB_HOST", "localhost");
 define( "DB_NAME", "sys_rdp");
 define( "DB_USER", "root");
 define( "DB_PASS", "vertrigo");
 
 //-------------------------------------------------------------------------------------------------------------------------------------------------- 
 
 class DBconnect{
 
    private static $instance;
	public  $pdo;
    private $db_host; 
    private $db_name; 
    private $db_user; 
    private $db_pass; 
 
    public function __construct($db_host, $db_name, $db_user, $db_pass)
	{
        try{
 
          $this->db_host = $db_host;
          $this->db_name = $db_name;
		  $this->db_user = $db_user;
          $this->db_pass = $db_pass;
 
          $this->pdo = new PDO('mysql:host='.$db_host.';dbname='.$db_name, $db_user, $db_pass, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"));
        }catch(PDOException $e){
          exit('Połączenie nie mogło zostać utworzone: ' . $e->getMessage());
        }
    }
 
	private function __clone(){}
 
    public static function getInstance ()
    {
        if (self::$instance === null) {
            self::$instance = new DBconnect(DB_HOST, DB_NAME, DB_USER, DB_PASS);
        }
        return self::$instance;
    }
 
 }
 
//-------------------------------------------------------------------------------------------------------------------------------------
 
 class User
 {
    public $id = "";
  	public $login = "";
	public $passwd = "";
	public $level = "";
	public $user_id = 0;
	public $email = "";
	public $mobile = "";
	public $data_add = "";
	public $username = "";
 
	public function __construct(){}
	public function addUser(){}
	public function deleteUser(){}
	public function updateUser(){}
 } 
//-------------------------------------------------------------------------------------------------------------------------------------
 
 class Authentication
 {
    private $db;
    public  $user;	
 
	public function __construct(){
      $this->db = DBconnect::getInstance();	
	  $this->user = new User;
	}
 
	public function get_param()
	{
      if( isset($_POST["login"]) and isset($_POST["passwd"]) ) {	
	    $this->user->login  = $_POST["login"];
	    $this->user->passwd = $_POST["passwd"];
		$_SESSION["login"] = $this->user->login;
		$_SESSION["passwd"] = $this->user->passwd;
		return true;
      }elseif(isset($_SESSION["login"]) and isset($_SESSION["passwd"]) ){
		$this->user->login = $_SESSION["login"];
		$this->user->passwd = $_SESSION["passwd"];	  
		return true;
      }else{
	    return false;
      }	  
	}
 
    public function login()
	{
	  if( $this->get_param() )
      {	
	 	$sql = "select * FROM users WHERE active = 1 and login = :login and passwd = md5(:passwd)";  
	    $query = $this->db->pdo->prepare($sql, array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY));
        $query->bindParam(':login', $this->user->login, PDO::PARAM_STR);
	    $query->bindParam(':passwd', $this->user->passwd, PDO::PARAM_STR);
        $query->execute();
	    $row = $query->fetch();
 
		    if( $query->rowCount() > 0 ) {			
				 $this->user->login    = "true";
				 $this->user->level    = $row["is_admin"];
				 $this->user->user_id  = $row["id"];
				 $this->user->username = $row["firstname"]." ".$row["lastname"];
		    }else{
 	             $this->user->login = "";
                 $this->user->passwd = "";
	             $this->user->level = "";
                 $this->user->user_id = 0;
	             $this->user->username = "";
		    }	             
	  }		
    }	
 
 }
[PHP] pobierz, plaintext 

rzucilem okiem na calosc i ma to sens. Kazdy pewne kwestie rozwiazuje naczej, ale ogolnie jest ok

dzieki za opinie, nawiązując do tego, że każdy ma swoje rozwiązania to może byście pokazali jak rozwiązujecie ten fragment serwisu www.