代理模式

/**
* proxy模式
*
* 为其他对象提供一个代理以控制这个对象的访问
*
*/
    interface Proxy
    {
        public function request();
        public function display();
    }
    
    class RealSubject
    {
        public function request()
        {
            echo "RealSubject request<br/>";
        }
        
        public function display()
        {
            echo "RealSubject display<br/>";
        }
    }

    class ProxySubject
    {
        private $_subject = null;
        
        public function __construct()
        {
            $this->_subject =new RealSubject();
        }
        
        public function request()
        {
            $this->_subject->request();
        }
        
        public function display()
        {
            $this->_subject->display();
        }
    }
    
$objProxy=new ProxySubject();
$objProxy->request();
$objProxy->display();

参考文章 https://wenku.baidu.com/view/b4c78b4702768e9951e738fb.html