How do I immediately execute an anonymous function in PHP?

Question

In JavaScript, you can define anonymous functions that are executed immediately:

(function () { /* do something */ })()

Can you do somethin

Answer 1

For PHP7: see Yasuo Ohgaki's answer: (function() {echo 'Hi';})();

For previous versions: the only way to execute them immediately I can think of is

call_user_func(function() { echo 'executed'; });