php工厂方法模式

1.工厂方法模式简介

   工厂方法模式定义一个用于创建对象的接口，让子类决定实例化哪一个类。工厂方法使一个类的实例化延迟到其子类。

2.源码实现

<?php

/*抽象工厂类*/
abstract class Factory {
    protected abstract function produce();
    public function startFactory()
    {
        $pro = $this->produce();
        return $pro;
    }
}

/*产品类接口*/
interface Product {
    public function getProperties();
}

/*文本产品*/
class TextProduct implements Product {
    private $text;

    function getProperties()
    {
        $this->text = "此处为文本";
        return $this->text;
    }
}

/*图像产品*/
class ImageProduct implements Product {
    private $image;

    function getProperties()
    {
        $this->image = "此处为图像";
        return $this->image;
    }
}

/*文本工厂*/
class TextFactory extends Factory {
    protected function produce()
    {
        $textProduct = new TextProduct();
        return $textProduct->getProperties();
    }
}

/*图像工厂*/
class ImageFactory extends Factory {
    protected function produce()
    {
        $imageProduct = new ImageProduct();
        return $imageProduct->getProperties();
    }
}

/*客户类*/
class Client {
    private $textFactory;
    private $imageFactory;

    public function __construct()
    {
        $this->textFactory = new TextFactory();
        echo $this->textFactory->startFactory()."\n";
        $this->imageFactory = new ImageFactory();
        echo $this->imageFactory->startFactory()."\n";
    }
}

$client = new Client();

?>

3.运行及其结果

$ php example.php
此处为文本
此处为图像