Merge branch 'PHP-7.4'

* PHP-7.4:
  Added reference to parser generator

Author: dstogov

ext/ffi/README.md

@@ -299,3 +299,7 @@ sudo make install
 ### Real Usage
 
 FFI extension was used to implement [PHP TensorFlow binding](https://github.com/dstogov/php-tensorflow)
+
+### FFI Parser
+
+FFI C parser is generated using [LLK](https://github.com/dstogov/llk).