Exciting times in PHP land. Nikita Popov, Levi Morrison and Bob Weinand have officially proposed a concrete implementation for arrow functions.

Anonymous functions in PHP can be quite verbose, even when they only perform a simple operation. Partly this is due to a large amount of syntactic boilerplate, and party due to the need to manually import used variables. This makes code using simple closures hard to read and understand. This RFC proposes a more concise syntax for this pattern. ... Short closures are critically overdue, and at some point we'll have to make a compromise here, rather than shelving the topic for another few years.

https://wiki.php.net/rfc/arrow_functions_v2

Let's hope this one gets accepted!