对象序列化

对象序列化__sleep(Object Serialization __sleep)

php手册说明：

它可以清理对象，并且应该返回一个数组，其中包含应该序列化的该对象的所有变量的名称。

我理解这一点，如果有一个班级。 喜欢这个：

<?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？ 喜欢这个：

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)

我解释错了吗？ 或者我做错了什么？

the php manual states:

It can clean up the object and is supposed to return an array with the names of all variables of that object that should be serialized.

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); ?>

it would only serialize the object and the property $bar? Like this:

object(Foo)[2] public 'bar' => string 'bar' (length=3)

but it returns:

object(Foo)[2] public 'bar' => string 'bar' (length=3) public 'baz' => string 'baz' (length=3)

Have i interpreted it wrong? Or am i doing it wrong or what?

最满意答案

反序列化会创建对象的新实例，并且由于您的类定义初始化了该属性，因此您将获得该属性的默认值。 尝试这个：

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);

编辑：或者，您可以vardump（$ serialized）并看到其中没有baz。

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);

Edit: Alternatively, you can vardump($serialized) and see that there is no baz in it.