<?php

class User
{
public $name;
public $id;

function __construct()
{
//give user a unique ID 赋予一个不同的ID
$this->id = uniqid();
}

function __sleep()
{
//do not serialize this->id 不串行化id
return(array("name"));
}

function __wakeup()
{
//give user a unique ID
$this->id = uniqid();
}
}

//create object 建立一个对象
$u = new User;
$u->name = "Leon";

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

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

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