Is it possible to write a function to a variable without calling it?

Question

Slider

In some modern CMS, I saw something like this: You write
$VARIABLE; what is a function call
? Is it possible to write a function into a variable so that when, for example, $FUNCTION is called, the process is executed $function = $class -> function();
I ask out of curiosity, to improve the readability of the code.

Answer 1

Implement the __invoke() magic method in the class, and then the class can be called as a function.