SimpleXMLElement Serialization

Description

From what i can tell the SimpleXMLElement class can be very easily serialised/unserialised which would be very useful for use with var_exports and keeping state between requests without the need for the stored source for the xml, would it be possible to have __serialise() which outputs the string representation of the xml, and __unserialise() which just calls simplexml_load_string() and returns the new instance?

the __set_state() method would also be useful but serialise would be beneficial to a larger audience

未指定文件或测试。首先定位 SimpleXMLElement 的实现和现有的 PHP 序列化钩子，然后将所请求的序列化、反序列化和 __set_state 行为与当前扩展约定进行比较。实现约定的 API 行为并通过测试覆盖后，即可视为完成。