ViewFactory class file. I'd like three classes that have the same logic as ViewFactory, but that implement their own build() logic. Is it possible to do it so that all three sub-classes are ViewFactorys? I'm especially trying to avoid copying and pasting the code because that seems to contradict OOP principles.

viewfactory.class.php

<?php
abstract class ViewFactory
{
    private $view;
    private $viewParameters;
    private $database;
    
    public function __construct($_database)
    {
        $this->view = new View(); // Defined elsewhere
        $this->viewParameters = new ViewParameters(); // Same here
        $this->database = $_database; // Database object initialised in index.php
                                      // and injected where it's needed.
    }
    
    public function getViewParameters()
    {
        return $this->viewParameters;
    }
    
    abstract public function build($token);
}

class UserViewFactory extends ViewFactory
{
    /* So I'd like a class that works the same way as ViewFactory, but that
     * implements its own build() logic. What do, from a general OOP
     * perspective?
     */
}
?>