职责链模式

职责链模式（又叫责任链模式）包含了一些命令对象和一些处理对象，每个处理对象决定它能处理那些命令对象，它也知道应该把自己不能处理的命令对象交下一个处理对象，该模式还描述了往该链添加新的处理对象的方法。

Demo

<?php 
   /**
    * Created by PhpStorm.
    */ 

   //申请Model 
   class Request 
   { 
       //数量 
       public $num; 
       //申请类型 
       public $requestType; 
       //申请内容 
       public $requestContent; 
   } 

   //抽象管理者 
   abstract class Manager 
   { 
       protected $name; 
       //管理者上级 
       protected $manager; 
       public function __construct($_name) 
       { 
           $this->name = $_name; 
       } 

       //设置管理者上级 
       public function SetHeader(Manager $_mana) 
       { 
           $this->manager = $_mana; 
       } 

       //申请请求 
       abstract public function Apply(Request $_req); 

   } 

   //经理 
   class CommonManager extends Manager 
   { 
       public function __construct($_name) 
       { 
           parent::__construct($_name); 
       } 
       public function Apply(Request $_req) 
       { 
           if($_req->requestType=="请假"&& $_req->num<=2) 
           { 
               echo "{$this->name}:{$_req->requestContent} 数量{$_req->num}被批准。<br/>"; 
           } 
           else 
           { 
               if(isset($this->manager)) 
               { 
                   $this->manager->Apply($_req); 
               } 
           } 

       } 
   } 

   //总监 
   class MajorDomo extends Manager 
   { 
       public function __construct($_name) 
       { 
           parent::__construct($_name); 
       } 

       public function Apply(Request $_req) 
       { 
           if ($_req->requestType == "请假"&& $_req->num <= 5) 
           { 
               echo "{$this->name}:{$_req->requestContent} 数量{$_req->num}被批准。<br/>"; 
           } 
           else 
           { 
               if (isset($this->manager)) 
               { 
                   $this->manager->Apply($_req); 
               } 
           } 

       } 
   } 


   //总经理 
   class GeneralManager extends Manager 
   { 
       public function __construct($_name) 
       { 
           parent::__construct($_name); 
       } 

       public function Apply(Request $_req) 
       { 
           if ($_req->requestType == "请假") 
           { 
               echo "{$this->name}:{$_req->requestContent} 数量{$_req->num}被批准。<br/>"; 
           } 
           else if($_req->requestType=="加薪"&& $_req->num <= 500) 
           { 
               echo "{$this->name}:{$_req->requestContent} 数量{$_req->num}被批准。<br/>"; 
           } 
           else if($_req->requestType=="加薪"&& $_req->num>500) 
           { 
               echo "{$this->name}:{$_req->requestContent} 数量{$_req->num}再说吧。<br/>"; 
           } 
       } 
   } 

$jingli = new CommonManager("李经理"); 
$zongjian = new MajorDomo("郭总监"); 
$zongjingli = new GeneralManager("孙总"); 

//设置直接上级 
$jingli->SetHeader($zongjian); 
$zongjian->SetHeader($zongjingli); 

//申请 
$req1 = new Request(); 
$req1->requestType = "请假"; 
$req1->requestContent = "小菜请假！"; 
$req1->num = 1; 
$jingli->Apply($req1); 

$req2 = new Request(); 
$req2->requestType = "请假"; 
$req2->requestContent = "小菜请假！"; 
$req2->num = 4; 
$jingli->Apply($req2); 

$req3 = new Request(); 
$req3->requestType = "加薪"; 
$req3->requestContent = "小菜请求加薪！"; 
$req3->num = 500; 
$jingli->Apply($req3); 

$req4 = new Request(); 
$req4->requestType = "加薪"; 
$req4->requestContent = "小菜请求加薪！"; 
$req4->num = 1000; 
$jingli->Apply($req4); 

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