PHP魔术方法__wakeup()
2018-09-17 15:00 By
"Powerless"
3339
0
1
与__sleep()方法相对的就是__wakeup()方法，常用来反序列化，如重建数据连接，或执行其他初始化操作等。
示例代码如下：
<?php
class Person
{
public $sex;
public $name;
public $age;
public function __construct($name="", $age=25, $sex='Male')
{
$this->name = $name;
$this->age = $age;
$this->sex = $sex;
}
/**
* @return array
*/
public function __sleep() {
echo "It is called when the serialize() method is called outside the class.<br>";
$this->name = base64_encode($this->name);
return array('name', 'age'); // 返回值中的元素必须是属性的名称
}
/**
* __wakeup
*/
public function __wakeup() {
echo "It is called when the unserialize() method is called outside the class.<br>";
$this->name = 2;
$this->sex = 'Male';
// 这里不需要返回数组
}
}
$person = new Person('John'); // 赋初始值
var_dump(serialize($person));
var_dump(unserialize(serialize($person)));
输出结果如下：
It is called when the serialize() method is called outside the class.
string(58) "O:6:"Person":2:{s:4:"name";s:8:"5bCP5piO";s:3:"age";i:25;}"
It is called when the unserialize() method is called outside the class.
object(Person)#2 (3) { ["sex"]=> string(3) "Male" ["name"]=> int(2) ["age"]=> int(25) }
View in WeChat
Others Discussion
-
初识七层、五层、四层网络协议 Posted on 2021-04-09 16:52
-
Redis各种数据类型的使用场景举例分析【二】 Posted on 2018-11-22 10:30
-
QPS、TPS、RT、吞吐量到底是什么 Posted on 2020-02-02 01:15
-
2018年云计算热词 Posted on 2019-06-12 18:19
-
Linux工具 - NM目标文件格式分析 Posted on 2019-04-24 10:29
-
ACID原则 Posted on 2020-12-17 16:36
-
前端知识体系精简-Css Posted on 2018-03-28 18:34
-
浏览器访问网站经历的步骤-Html Posted on 2018-11-28 18:48
评 论