php设计模式入门-注册表模式_PHP教程

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Release: 2016-07-13 09:45:28
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php设计模式入门-注册表模式

对于这个模式的应用场景不是太好总结,只是根据之前的经验,注册表类里面经常会存储一些别的地方需要用到的对象,比如redis、memcache类,还比如配置信息config类等,它扮演的是一个类似于全局变量的角色。具体的实现其实非常简单,如下代码所示:

 

<!--?php
class Registry{
     static $instance;
     public $containers = array();

     static function getInstance(){
          if(is_null(self::$instance)){
               self::$instance = new self();
          }
          return self::$instance;
     }

     public function set($key, $value){
          $this--->containers[$key] = $value;
     }

     public function get($key){
          return isset($this->containers[$key]) ? $this->containers[$key] : null;
     }
}

$registry = Registry::getInstance();
$registry->set(&#39;key1&#39;, &#39;hello&#39;);<span style="white-space:pre">	</span>//只是为了测试,通常注册表中存储的数据都是对象
var_dump($registry->get(&#39;key1&#39;));
var_dump($registry->get(&#39;key2&#39;));
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