Implement simple factory pattern with PHP code

//家禽类 abstract class Fowl { abstract public function eat();//吃方法 }

//牛类 class Cattle extends Fowl { public function eat() { echo "我是牛，我吃草"; } } //鸭类 class Duck extends Fowl { public function eat() { echo "我是鸭，我吃鱼"; } } //羊类 class Sheep extends Fowl { public function eat() { echo "我是羊，我吃草"; } }

//工厂类 class Factory { public static function create($fowlName) { switch ($fowlName) { case 'Cattle': return new Cattle(); break; case 'Duck': return new Duck(); break; case 'Sheep': return new Sheep(); break; } } }

$cattle = Factory::create('Cattle'); $cattle->eat();//我是牛，我吃草 $duck = Factory::create('Duck'); $duck->eat();//我是鸭，我吃鱼 $sheep = Factory::create('Sheep'); $sheep->eat();//我是羊，我吃草