<?php

/**

 * 设计模式——依赖倒置原则实例

 * Created by DannyWang

 * jue.wang@yulore.com

 * 2015-05-05

 */

abstract class People {

    public abstract function eat(Fruit $fruit);//这里符合了里氏替换原则

}

abstract class Fruit {

    public abstract function getName();

}

class Danny extends People {

    public function eat(Fruit $fruit) {//这里符合了里氏替换原则

        echo 'Danny like eat ' . $fruit->getName() . '<br/>';

    }

}

class Apple extends Fruit {

    public function getName() {

        return 'Apple';

    }

}

class Banana extends Fruit {

    public function getName() {

        return 'Banana';

    }

}

//client

$me = new Danny();

$me->eat(new Apple());//这里符合了里氏替换原则

$me->eat(new Banana());//这里符合了里氏替换原则

//Danny like eat Apple

//Danny like eat Banana

?>