<?php 
   class Overloader 
   { 
       private $properties = array(); 

       function __get($property_name) 
       { 
           if(isset($this->properties[$property_name])) 
           { 
               return($this->properties[$property_name]); 
           } 
           else 
           { 
               return(NULL); 
           } 
       } 

       function __set($property_name, $value) 
       { 
           $this->properties[$property_name] = $value; 
       } 

       function __call($function_name, $args) 
       { 
           print("Invoking $function_name()<br>\n"); 
           print("Arguments: "); 
           print_r($args); 

           return(TRUE); 
       } 
   } 
   $o = new Overloader(); 

   //invoke __set() 给一个不存在的属性变量赋值,激活__set() 
   $o->dynaProp = "Dynamic Content"; 

   //invoke __get() 激活__get() 
   print($o->dynaProp . "<br>\n"); 

   //invoke __call() 激活__call() 
   $o->dynaMethod("Leon", "Zeev"); 
?>