Hi internals, I'd like to start the discussion for [RFC: Spread Operator in Array Expression](https://wiki.php.net/rfc/spread_operator_for_array). In short, this is a syntax similar to argument unpacking, but for array.
You can find the implementation [here](https://github.com/php/php-src/pull/3640). It's still WIP, but I'll finish it in the next following weeks. Thanks & Best regards, CHU Zhaowei
