12.PHP 预定义接口 --- 序列化接口

<?php

class obj implements Serializable {
private $data;
public function __construct() {
var_dump(__METHOD__);
$this->data = "My private data";
}
public function serialize() {
var_dump(__METHOD__);
$a = serialize($this->data);
return $a;
}
public function unserialize($data) {
var_dump(__METHOD__);
$this->data = unserialize($data);
}
public function getData() {
var_dump(__METHOD__);
return $this->data;
}

public function __destruct()
{
var_dump(__METHOD__);
// TODO: Implement __destruct() method.
}
}

$obj = new obj;
$ser = serialize($obj);

$newobj = unserialize($ser);

var_dump($newobj->getData());