策略模式 实例

<?php

interface FlyBehavior{

    public function fly();

}

 

class FlyWithWings implements FlyBehavior{

    public function fly(){

        echo "Fly With Wings ";

    }

}

 

class FlyWithNo implements FlyBehavior{

    public function fly(){

        echo "Fly With No Wings ";

    }

}

class Duck{

    private $_flyBehavior;

    public function performFly(){

        $this->_flyBehavior->fly();

    }

 

    public function setFlyBehavior(FlyBehavior $behavior){

        $this->_flyBehavior = $behavior;

    }

}

 

class RubberDuck extends Duck{

}

// Test Case

$duck = new RubberDuck();

 

/*  想让鸭子用翅膀飞行 */

$duck->setFlyBehavior(new FlyWithWings());

$duck->performFly();           

 

/*  想让鸭子不用翅膀飞行 */

$duck->setFlyBehavior(new FlyWithNo());

$duck->performFly();