Using usort in php with a class private function

Question

ok using usort with a function is not so complicated

This is what i had before in my linear code

function merchantSort($a,$b){
    return ....// stuf         


        

Answer 1

In Laravel (5.6) model class, I called it like this, both methods are public static, using php 7.2 on windows 64 bit.

public static function usortCalledFrom() 

public static function myFunction()

I did call in usortCalledFrom() like this

usort($array,"static::myFunction")

None of these were work

usort($array,"MyClass::myFunction")
usort($array, array("MyClass","myFunction")