AbstractFactory(抽象工廠模式)

　　有些情況下我們需要根據不同的選擇邏輯提供不同的構造工廠，而對於多個工廠而言需要一個統一的抽象

<?php
 
class Config {
    public static $factory = 1;
}
 
interface Product {
    public function getName();
}
 
abstract class AbstractFactory {
 
    public static function getFactory() {
        switch (Config::$factory) {
            case 1:
                return new FirstFactory();
            case 2:
                return new SecondFactory();
        }
        throw new Exception(‘Bad config‘);
    }
 
    abstract public function getProduct();
}
 
class FirstFactory extends AbstractFactory {
    public function getProduct() {
        return new FirstProduct();
    }
}
class FirstProduct implements Product {
    public function getName() {
        return ‘The product from the first factory‘;
    }
}
 
class SecondFactory extends AbstractFactory {
    public function getProduct() {
        return new SecondProduct();
    }
}
class SecondProduct implements Product {
    public function getName() {
        return ‘The product from second factory‘;
    }
}
 
$firstProduct = AbstractFactory::getFactory()->getProduct();
Config::$factory = 2;
$secondProduct = AbstractFactory::getFactory()->getProduct();
 
print_r($firstProduct->getName());
// The first product from the first factory
print_r($secondProduct->getName());
// Second product from second factory

AbstractFactory(抽象工廠模式)