__sleep() 和 __wakeup()
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 )

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