FFI PHP extension

[uasan]

Hello.

Maybe you will be interested:
FFI PHP extension (Foreign Function Interface)
https://github.com/dstogov/php-ffi

The author asks for feedback and testing.

[kleisauke]

It looks promising, if the speed is optimized (access to FFI data structures is significantly (about 2 times) slower -- according to the readme), I'll investigate this and try to make a proof of concept.

Hopefully the requirement of PHP 7.3 (php-master) will be reduced to >= PHP 7.1 in the near future.

[jdreesen]

It's part of the PHP core since v7.4.

[jcupitt]

See #50 for an implementation of php-vips-ext using php ffi.