PHP之装饰器模式

最新推荐文章于 2025-03-28 19:54:42 发布

xmlol369

最新推荐文章于 2025-03-28 19:54:42 发布

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CC 4.0 BY-SA版权

分类专栏：设计模式文章标签： php function class integer object

本文链接：https://blog.youkuaiyun.com/xmlol369/article/details/2900143

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本文通过一个具体的PHP代码示例介绍了装饰者模式的应用。该模式允许开发者在不改变原有对象结构的前提下，动态地增加其职责。文章展示了一个评级系统的实现过程，通过继承和组合的方式为基本的评分对象添加不同级别的评分。

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<?php
abstract class AbstractRating {
   protected $decoratable;
   public function __construct( $decoratable ) {
       $this -> decoratable = $decoratable;
   }
   abstract public function getRating();
}

class PoorRating extends AbstractRating {
   protected $rating = 1;
   public function __construct($decoratable) {
       parent::__construct( $decoratable );
   }
   public function getRating() {
       return $this -> decoratable -> getRating() + $this -> rating;
   }
}

class AverageRating extends AbstractRating {
   protected $rating = 2;
   public function __construct( $decoratable ) {
       parent::__construct( $decoratable );
   }
   public function getRating() {
       return $this -> decoratable -> getRating() + $this -> rating;
   }
}

class GoodRating extends AbstractRating {
   protected $rating = 3;
   public function __construct( $decoratable ) {
       parent::__construct( $decoratable );
   }
   public function getRating() {
       return $this -> decoratable -> getRating() + $this -> rating;
   }
}

class Ratings {
   private $rating = 3;
   public function __construct() { }
   public function getRating() {
       return $this -> rating; // typeof integer
   }
}
$rating = new GoodRating( new AverageRating( new Ratings ) );     // we are decorating the Ratings object
echo($rating -> getRating());
?>