简介
工厂方法中，每一个具体工厂类都对应创建一个具体产品类，所有具体工厂类都实现抽象工厂，所有具体产品类都实现抽象产品。
抽象工厂定义了创建抽象产品的方法签名，具体工厂类各自实现各自逻辑，来创建具体的产品。
角色
类图
如图所示，Dialog 抽象工厂可以创建 Button 抽象产品，WindowsDialog 和 WebDialog 都是具体工厂，负责创建 WindownsButton 和 HTMLButton。
代码
abstract class Creator{ abstract public function factoryMethod(): Product;
public function someOperation(): string { $product = $this->factoryMethod(); $result = "Creator: The same creator's code has just worked with " . $product->operation(); return $result; }}
class ConcreteCreator1 extends Creator{ public function factoryMethod(): Product { return new ConcreteProduct1(); }}
class ConcreteCreator2 extends Creator{ public function factoryMethod(): Product { return new ConcreteProduct2(); }}
interface Product{ public function operation(): string;}
class ConcreteProduct1 implements Product{ public function operation(): string { return "{Result of the ConcreteProduct1}"; }}
class ConcreteProduct2 implements Product{ public function operation(): string { return "{Result of the ConcreteProduct2}"; }}
function clientCode(Creator $creator){ echo "Client: I'm not aware of the creator's class, but it still works.\n" . $creator->someOperation() . "\n";}
echo "App: Launched with the ConcreteCreator1.\n";clientCode(new ConcreteCreator1());
echo "App: Launched with the ConcreteCreator2.\n";clientCode(new ConcreteCreator2());
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output
App: Launched with the ConcreteCreator1.Client: I'm not aware of the creator's class, but it still works.Creator: The same creator's code has just worked with {Result of the ConcreteProduct1}App: Launched with the ConcreteCreator2.Client: I'm not aware of the creator's class, but it still works.Creator: The same creator's code has just worked with {Result of the ConcreteProduct2}
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