12.PHP 预定义接口 --- 序列化接口

<?phpclass 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());

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http://php.net/manual/zh/class.serializable.php