php "pure" OOP: how design classes? - php

Question

PREAMBLE: I use F3 Framework (www.fatfreeframework.com).
Let's say I have an abstract class "Controller"
<?php
abstract class Controller
{
/* F3 */
protected $f3;
/* DATABASE SECTION */
protected $db_name;
protected $db_host;
protected $db_username;
protected $db_password;
function __construct()
{
$f3 = Base::instance();
$this->f3 = $f3;
}
protected function get_db_name()
{
return $this->db_name;
}
protected function get_db_host()
{
return $this->db_host;
}
protected function get_db_username()
{
return $this->db_username;
}
protected function get_db_password()
{
return $this->db_password;
}
protected function set_db_name($db_name)
{
$this->db_name = $db_name;
}
protected function set_db_host($db_host)
{
$this->db_host = $db_host;
}
protected function set_db_username($db_username)
{
$this->db_username = $db_username;
}
protected function set_db_password($db_password)
{
$this->db_password = $db_password;
}
} // /class Controller
And a FrontendController Class:
<?php
class FrontendController extends Controller
{
public function get_view()
{
$this->set_db_host('localhost');
}
}
His work it's manage frontend website (html, print results from database, etc etc etc).
After some day, I need the BackendController class, to manage the news of the site (for example).
1) I need to rewrite the db connections (for example) ? Or I will move them in construct of Controller?
2) In effect, from point 1, I did think to add them in __construct of subclass but ofcourse it override the __construct of abstract Class
3) Tomorrow I want create a ToolboxController Class. Let's say it's scope will be perform some task (e.g. "extract first X characters from a text", "format data according to user settings"), all code pieces that I will/can reuse in other part of app.
In this case I will need to refactor all website changing from:
Controller <= FrontendController
Controller <= BackendController
to
Controller <= ToolboxController <= FrontendController
Controller <= ToolboxController <= BackendController
where <= mean "extends" ?
It seems very very stupid question and easy, but I would understand logic process of add new functions to a born-small website to a large portal.

Answer 1

You do it the Wrong way. The root of your Problem is, you have no Model.
A Model is not a simple class, it as a whole abstraction layer.
Domain Object
Value Object
Database Mapper
Service
Read this good answer, to learn about it.
At the end, you Goal should be something like this this
$model = new Model();
$controller = new Controller($model);
$view = new View($model);
The View and the Controller shares the same Model, and they get it. They don't know how to obtain.