public array __sleep ( void )
void __wakeup ( void )
serialize() 函数会检查类中是否存在一个魔术方法 __sleep()。如果存在，该方法会先被调用，然后才执行序列化操作。此功能可以用于清理对象，并返回一个包含对象中所有应被序列化的变量名称的数组。如果该方法未返回任何内容，则 NULL 被序列化，并产生一个 E_NOTICE 级别的错误。
示例：
class user { public $name; public $id; function __construct() { // 给id成员赋一个uniq id $this->id = 'asas'; } function __sleep() { //此处不串行化id成员 return(array('name')); } function __wakeup() { $this->id = uniqid(); }}$u = new user();$u->name = "Leo";$s = serialize($u); //serialize串行化对象u，此处不串行化id属性，id值被抛弃$u2 = unserialize($s); //unserialize反串行化，id值被重新赋值//对象u和u2有不同的id赋值print_r($u);print_r($u2);结果：
user Object ( [name] => Leo [id] => asas ) user Object ( [name] => Leo [id] => 5621ed9f6614c )
Usage of items in python
What is the difference between xls and xlsx
vscode runs c language
How to solve no route to host
How to operate json with jquery
What does data encryption storage include?
How to import mdf files into database
The difference between lightweight application servers and cloud servers
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
