While I agree that it should have been done this way from the start, I'm a bit unsure about the BC break this implicates.

What's your suggestion how to write version agnostic code, allowing code to be written in PHP 8.0.0 and PHP 8.2.0? For handling class type hints I can polyfill class_alias("FFI", "FFI\\CDef"). But what about the static vs non-static methods (in particular new())? The cdef parameter did not exist beforehand.

1. I suggestion next release version of 8.1
2. Now new() cast() type() can be called by two ways (statically and non-statically), this is weird
3. FFI object non-statically method will conflict with load DLL C function, when they same name. if FFI will adding new non-statically method and must add special handling, and block same C function. this is not best way.
4. $cdef parameter is optional and is at end, so can append cdef : $cdef for compatible. if be called by statically and no pass it will same as now. if be called by non-statically will invoke C function, old code will report not exists C function error

so class_alias can not resolve above these issues

I suggestion next release version of 8.1

This cannot go into 8.1. It will need to go into 8.2, if it's accepted.

I fully agree with @bwoebi's comment above; while it might better have been done this way from the beginning, I don't think we can change it for BC reasons. At least this should go through the RFC process.

@cmb69
Is need me submit a RFC in https://wiki.php.net/rfc

Is need me submit a RFC in https://wiki.php.net/rfc

Yes. See https://wiki.php.net/rfc/howto on how to do it.

Yes. See https://wiki.php.net/rfc/howto on how to do it.

OK，I'll submit it when I have free time

I can not login to php wiki. so i maybe not submit the RFC.
wait other people submit it.

I can not login to php wiki.

Why? What happens?

There is a user chopins with RFC karma, so login via https://wiki.php.net/?do=login should be possible. If you forgot your password, there is a link "Set new password" on that page.