PHP 利用闭包偷窥马对人类的想法

 <?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!