# 0x02正文

## 一.nextphp

FFI is one of the features that made Python and LuaJIT very useful for fast prototyping. It allows calling C functions and using C data types from pure scripting language and therefore develop “system code” more productively. For PHP, FFI opens a way to write PHP extensions and bindings to C libraries in pure PHP.

The __serialize() and __unserialize() methods reuse the O serialization format used by ordinary object serialization, as well as __sleep()/__wakeup(). This means that the data array returned by __serialize() will be stored as-if it represented object properties.

In principle, this makes existing strings serialized in O format fully interoperable with the new serialization mechanism, the data is just provided in a different way (for __wakeup() in properties, for __unserialize() as an explicit array). If a class has both __sleep() and __serialize(), then the latter will be preferred. If a class has both __wakeup() and __unserialize() then the latter will be preferred.

If a class both implements Serializable and __serialize()/__unserialize(), then serialization will prefer the new mechanism, while unserialization can make use of either, depending on whether the C (Serializable) or O (__unserialize) format is used. As such, old serialized strings encoded in C format can still be decoded, while new strings will be produced in O format.

FFI::cdef创建一个FFI对象