php八大设计模式之装饰器模式

  我们都知道，得到一匹布需要大概这么几步：
       1、染色
       2、印花
       3、裁剪
  这种形式在面向对象中怎么实现呢？

面向过程【继承模式】实现：

    继承模式得到需要的布料，一步一步的加工。
    继承的层次越来越深，扩展性差。如果中间加道其他程序，就有些吃力了。

<?php
    header("content-type:text/html;charset=utf8");
    class BaseCloth{         //布料初始的样子
        protected $content;
        public function __construct($con){
            $this->content=$con;
        }
        public function cloth(){
            return $this->content;
        }
    }
    class DyeingCloth extends BaseCloth{   //染色
        public function dyeing(){
            return $this->content."  --->染上色";
        }
    }
    class StampCloth extends DyeingCloth{   //印花
        public function stamp(){
            return $this->content."  --->印上好看的花";
        }
    }
    class CutCloth extends StampCloth{      //裁剪
        public function cut(){
            return $this->content."  --->根据需求裁剪";
        }
    }

    //布料加工。
    $cloth= new BaseCloth("白布");
    $dyeing=new DyeingCloth($cloth->cloth());
    $stamp=new StampCloth($dyeing->dyeing());
    $cut=new CutCloth($stamp->stamp());
    echo $cut->cut();
?>

装饰器模式实现布匹加工。

<?php
    header("content-type:text/html;charset=utf8");
    /**
     * 装饰器模式完成布料的加工。动态、扩展性好。
     */
    class BaseCloth{         //布料的初始样子
        protected $content;
        public function __construct($con){
            $this->content=$con;
        }
        public function cloth(){
            return $this->content;
        }
    }
    class DyeingCloth extends BaseCloth{   //染色
        public function __construct(BaseCloth $cloth){
            $this->cloth=$cloth;
            $this->cloth();
        }
        public function cloth(){
            return $this->cloth->cloth()."  --->染上色";
        }
    }
    class StampCloth extends BaseCloth{   //印花
        public function __construct(BaseCloth $cloth){
            $this->cloth=$cloth;
            $this->cloth();
        }
        public function cloth(){
            return $this->cloth->cloth()."  --->印上花";
        }
    }
    class CutCloth extends BaseCloth{      //裁剪
        public function __construct(BaseCloth $cloth){
            $this->cloth=$cloth;
            $this->cloth();
        }
        public function cloth(){
            return $this->cloth->cloth()."  --->根据需求裁剪";
        }
    }

    //布料加工。
    $con=new CutCloth(new DyeingCloth(new BaseCloth("白布")));
    echo $con->cloth();
?>