工厂模式

工厂模式是另一种非常常用的模式，正如其名字所示：确实是对象实例的生产工厂。某些意义上，工厂模式提供了通用的方法有助于我们去获取对象，而不需要关心其具体的内在的实现

<?php
 
interface Factory {
    public function getProduct();
}
 
interface Product {
    public function getName();
}
 
class FirstFactory implements Factory {
 
    public function getProduct() {
        return new FirstProduct();
    }
}
 
class SecondFactory implements Factory {
 
    public function getProduct() {
        return new SecondProduct();
    }
}
 
class FirstProduct implements Product {
 
    public function getName() {
        return 'The first product';
    }
}
 
class SecondProduct implements Product {
 
    public function getName() {
        return 'Second product';
    }
}
 
$factory = new FirstFactory();
$firstProduct = $factory->getProduct();
$factory = new SecondFactory();
$secondProduct = $factory->getProduct();
 
print_r($firstProduct->getName());
// The first product
print_r($secondProduct->getName());
// Second product