Decorator模式

Decorator(装饰器)模式能够像标准的继承一样为类添加新的功能。

不同于标准继承机制的是,如果对象进行了实例化,Decorator模式能够在运行时动态地为对象添加新的功能。

<?php
abstract class AbstractCar{public abstract  function getPrice();public abstract function getManufacturer();
}
class Car extends AbstractCar{private  $price=200000;private $manufacturer='bmw';public function getPrice(){return $this->price;}public function getManufacturer(){return $this->manufacturer;}
}class CarDecorator extends AbstractCar{private $target;public function __construct(Car $target){$this->target=$target;}public function getPrice(){return $this->target->getPrice();}public function getManufacturer(){return $this->target->getManufacturer();}
}class NavigationSystem extends CarDecorator{public function getPrice(){return parent::getPrice()+1000;}
}$car=new Car();
$car=new NavigationSystem($car);echo $car->getPrice();?>