Design pattern Décorateur (http://kandran.fr/design-pattern-decorateur/)

Accelerator.php

<?php
require_once("Ship.php");

class Accelerator extends Ship
{
    
    protected $ship;
    
    public function __construct(Ship $ship)
    {
        $this->ship = $ship;
        $this->speed = 10;
    }
    
    public function getSpeed()
    {
        return $this->speed + $this->ship->getSpeed();
    }
}

JediShip.php

<?php
require_once("Ship.php");


class JediShip extends Ship
{
    public function __construct()
    {
        $this->speed = 100;
    }
}

Ship.php

<?php

abstract class Ship
{
    protected $speed;
  
    public function getSpeed()
    {
        return $this->speed;
    }
}

Warehouse.php

<?php
require_once("JediShip.php");
require_once("Accelerator.php");



$jediShipObject = new JediShip(); // extends of Ship

$jediShipObject->getSpeed(); // return 100

$jediShipObject = new Accelerator($jediShipObject);  // extends of Ship

$jediShipObject->getSpeed(); // return 110

$jediShipObject = new Accelerator($jediShipObject);  // extends of Ship


$jediShipObject->getSpeed(); // return 120