PHP 팩토리 메소드 설계 패턴 사례에 대한 자세한 설명

<?php
/**
*  一般工厂方法设计模式
**/
//工厂抽象类
abstract class Factory
{
  protected abstract function produce();
  public function startFactory()
  {
    $pro = $this->produce();
    return $pro;
  }
}
//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();
  }
}
//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;
  }
}
//客户类
class Client
{
  private $textFactory;
  private $imageFactory;
  public function construct()
  {
    $this->textFactory = new TextFactory();
    echo $this->textFactory->startFactory() . &#39;<br />&#39;;
    $this->imageFactory = new ImageFactory();
    echo $this->imageFactory->startFactory() . &#39;<br />&#39;;
  }
}
$client = new Client();
/*运行结果：
此处为文本
此处为图像
*/
?>

<?php
/**
*  参数化工厂方法设计模式
**/
//工厂抽象类
abstract class Factory
{
  protected abstract function produce(Product $product);
  public function startFactory(Product $product)
  {
    $pro = $this->produce($product);
    return $pro;
  }
}
//工厂实现
class ConcreteFactory extends Factory
{
  protected function produce(Product $product)
  {
    return $product->getProperties();
  }
}
//产品类接口
interface Product
{
  public function getProperties();
}
//文本产品
class TextProduct implements Product
{
  private $text;
  public function getProperties()
  {
    $this->text = "此处为文本";
    return $this->text;
  }
}
//图像产品
class ImageProduct implements Product
{
  private $image;
  public function getProperties()
  {
    $this->image = "此处为图像";
    return $this->image;
  }
}
//客户类
class Client
{
  private $factory;
  private $textProduct;
  private $imageProduct;
  public function construct()
  {
    $factory = new ConcreteFactory();
    $textProduct = new TextProduct();
    $imageProduct = new ImageProduct();
    echo $factory->startFactory($textProduct) . &#39;<br />&#39;;
    echo $factory->startFactory($imageProduct) . &#39;<br />&#39;;
  }
}
$client = new Client();
/*运行结果：
此处为文本
此处为图像
*/
?>