Introduction to Pragmatic Functional PHP
php / performance / testing
Watch the video session here.
Functional programming is a paradigm with origins in lambda calculus and the 1930's. Stack Overflow's developer surveys from both 2017 and 2018 show that the languages optimized for functional programming are low in popularity. However, the same survey recognizes that developers actually working in Elixir, Clojure, F#, and Haskell, actually love their languages much more than PHP or C developers.
So functional programming is unpopular but fun!