class="language-class="tags" href="/tags/PHP.html" title=php>php"><?class="tags" href="/tags/PHP.html" title=php>php
  class User
   {
       public $name;
       public $id;

       class="tags" href="/tags/FUNCTION.html" title=function>function __construct()
       {
           $this->id = uniqid();          //give class="tags" href="/tags/USER.html" title=user>user a unique ID 赋予一个不同的ID
       }

       class="tags" href="/tags/FUNCTION.html" title=function>function __sleep()
       {   
           return(array("name"));        //do not serialize this->name 不串行化name
       }

       class="tags" href="/tags/FUNCTION.html" title=function>function __wakeup()
       {
           $this->id = uniqid();         //give class="tags" href="/tags/USER.html" title=user>user a unique ID,id在反序列化时，被重新赋值
       }
   }

   $u = new User;
   $u->name = "HAHA";

   $s = serialize($u);                   //serialize it 串行化 注意不串行化id属性,id的值被抛弃

   $u2 = unserialize($s);                //unserialize it 反串行化 id被重新赋值

  
   //$u and $u2 have different IDs $u和$u2有不同的ID
   var_dump($u);                        
   var_dump($u2); 

 
?>
结果如下：

class="language-html">class="tags" href="/tags/OBJECT.html" title=object>object(User)[1]
  public 'name' => class="tags" href="/tags/STRING.html" title=string>string 'HAHA' (length=4)
  public 'id' => class="tags" href="/tags/STRING.html" title=string>string '4e546b245baa1' (length=13)

class="tags" href="/tags/OBJECT.html" title=object>object(User)[2]
  public 'name' => class="tags" href="/tags/STRING.html" title=string>string 'HAHA' (length=4)
  public 'id' => class="tags" href="/tags/STRING.html" title=string>string '4e546b245bad1' (length=13)