There are 2 repositories under php-ffi topic.
PHP Kafka client - binding librdkafka via FFI
PHP example to integrate DuckDB using PHP-FFI
PHP/FFI class for wkhtmltox C library
php-ffi experiment php-opencv
PHP bindings for libvoikko
Demonstrating the use of php-ffi to call darknet and YOLOv3 for object detection. ffi is bundled since php7.4. The manual alone didn't show me how it felt to use. Hands-on I learned a bit more about it. This repository is the toy I built to try it out. Have you tried doing nightmare mode? I haven't.
FFI wrapper for [webview](https://github.com/webview/webview)
PHP wrapper class for GhostscriptAPI