What are the pitfalls to avoid with this new version of PHP and its new functionalities? As my previous article on PHP 7 scalar and return types pitfalls, instead of describing the new super cool features of this perfect PHP 7.2, I will describe what can be dangerous for the good health of your application. As Ward Cunningham stated it: “You know you are working on clean code when each routine you read turns out to be pretty much what you expected.