Executing Anonymous Functions Instantly in PHP

In JavaScript, defining and executing anonymous functions immediately is straightforward using the syntax:

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

Is there a similar mechanism in PHP?

PHP 7

With PHP versions 7 and later, anonymous functions can be executed instantly and conveniently:

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

Pre-PHP 7

Prior to PHP 7, the only way to achieve immediate execution was through the call_user_func() function:

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