本文介绍了对象序列化__sleep的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
php手册指出:
我理解为，如果一个人上过课.像这样:
i understand this as, if a had a class. Like this:
<?php
class Foo {
public $bar = 'bar';
public $baz = 'baz';
public function __sleep() {
return array('bar');
}
}
$obj = new Foo();
$serialized = serialize($obj);
$unserialized = unserialize($serialized);
var_dump($unserialized);
?>
它只会序列化对象和属性$ bar?像这样:
it would only serialize the object and the property $bar? Like this:
object(Foo)[2]
public 'bar' => string 'bar' (length=3)
但它返回:
object(Foo)[2]
public 'bar' => string 'bar' (length=3)
public 'baz' => string 'baz' (length=3)
我把它解释错了吗?还是我做错了什么?
Have i interpreted it wrong? Or am i doing it wrong or what?
推荐答案
反序列化将创建对象的新实例，并且由于您对类的定义会初始化属性，因此您将获得该属性的默认值.试试这个:
Unserializing creates a new instance of the object, and since your definition of the class initializes the attribute, you're getting a default value for it. Try this:
class Foo {
public $bar;
public $baz;
public function __sleep()
{
return array('bar');
}
}
$obj = new Foo();
$obj->bar = 'bar';
$obj->baz = 'baz';
$serialized = serialize($obj);
$unserialized = unserialize($serialized);
var_dump($unserialized);
或者，您可以存储($ serialized)并查看其中没有baz.
Alternatively, you can vardump($serialized) and see that there is no baz in it.
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