<?php
abstract class Coffee {
        private $coffeeComponents = [];
 
        public function addComponent(ICoffeeComponent $component) {
                $type = get_class($component);
                $this->coffeeComponents[$type] = $component;
        }
 
        protected function getComponent($type) { // Make public if you want access from outside, but you should not really.
                if (!is_string($type)) {
                        $argType = is_object($type) ? get_class($type) : gettype($type);
                        throw new InvalidArgumentException(
                                get_class($this).'::getComponent expects parameter 1 to be string. '.$argType.' given.'
                        );
                }
                if (!isset($this->coffeeComponents[$type])) {
                        throw new InvalidArgumentException(get_class($this).' has no component: '.$type);
                }
 
                return $this->coffeeComponents[$type];
        }
}
 
interface ICoffeeComponent {
        // common interface here.
}
 
class SugarCube implements ICoffeeComponent {
        // implement common interface.
 
        // specific stuff.
        public function foo() {
                echo 'bar';
        }
}
 
class Expresomix implements ICoffeeComponent {
        // implement common interface.
 
        // specific stuff.
}
 
class Beverage extends Coffee {
        public function foo() {
                $component = $this->getComponent('SugarCube');
                $component->foo();
        }
}
 
$coffee = new Beverage();
 
$coffee->addComponent(new SugarCube());
$coffee->addComponent(new Expresomix());
 
$coffee->foo();

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