<?phpinterface FlyBehavior{ public function fly();}class FlyWithWings implements FlyBehavior{ public function fly(){ echo "Fly With Wings \n"; }}class FlyWithNo implements FlyBehavior{ public function fly(){ echo "Fly With No Wings \n"; }}
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();
原文：http://www.cnblogs.com/yangtzewang/p/5789621.html