<?php

 /**

  * reference：http://www.php.net/manual/en/reflectionmethod.getclosure.php

  * Learn this and you will know How to peer through what a horse is thinking!

  *

  * Class Client

  */

 class People

 {

     private $heartWords = "How beautiful the horse is!I want to ride it!";

     public function hook()

     {

         $who = get_class($this);

         echo  ucfirst($who). " says :".$this->heartWords. "\n";

     }

     public function peer()

     {

         return function(){

             $this->hook();

         };

     }

 }

 class Horse

 {

     private $heartWords = "How silly the guy is! A big ass!";

 }

 $people = new People();

 $horse  = new Horse();

 try{

     $reflection = new ReflectionClass(get_class($people));

 }

 catch(ReflectionException $e)

 {

     echo $e->getMessage() ."\n";

     return;

 }

 $closure = $reflection->getMethod('hook')->getClosure($people);

 $truth = $closure->bindTo($horse,$horse);

 $truth();     //  Horse says :How silly the guy is! A big ass!