Decorator-pattern-03.php

<?php

interface CarService
{
    public function getCost();
}

class BasicInspection implements CarService
{
    public function getCost()
    {
        return 20;
    }

}


class OilChange implements CarService
{
    protected $car_service;

    public function __construct(CarService $car_service)
    {
        $this->car_service = $car_service;

    }

    public function getCost()
    {
        return 19 + $this->car_service->getCost();
    }

}


class TireRotation implements CarService
{
    protected $car_service;

    function __construct(CarService $car_service)
    {

        $this->car_service = $car_service;

    }

    public function getCost()
    {
        return 10 + $this->car_service->getCost();
    }

}


echo (new BasicInspection())->getCost(); // just basic inspection = 20

echo (new TireRotation(new OilChange(new BasicInspection())))->getCost(); // basic inspection and oil change and tire rotation = 49

echo (new TireRotation(new BasicInspection()))->getCost(); //  basic inspection and tire rotation = 30