[RFC] Arrow Functions

I messaged the list about this feature before I had the RFC written up for it. The RFC[1] is slightly different from what I proposed in the previous thread, so please read the RFC to make sure you understand what is being proposed before replying here. Here's a small example: $y = 10; $result = array_map(function($x) => $x + $y, [1, 2, 3]); // $result is [11, 12, 13] Thanks for people who have participated in conversation so far, as well as those who participated in Bob's short closures proposal as well. [1]: https://wiki.php.net/rfc/arrow_functions