First-class callable syntax usage in Laravel

If we exaggerate a little, there's always something new to learn when reading someone else's code, even for seasoned veterans like Freek Van der Herten.

In his article, Discovering PHP's first-class callable syntax, Freek shares how he came across a PHP feature while examining the Laravel codebase.

This is the first example I've come across where this particular feature is employed in such an appealing way.