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    unfortunately this boilerplate framework doesn't support closures - the 2nd parameter MUST be an object, and the 3rd parameter MUST be a string representing a publicly accessible method available on the object provided in the 2nd parameter. To use the boilerplate approach, the siimplest solution is create a dedicated class with a method you can use in place of your anonymous function. I suppose you could use an anonymous class (php.net/manual/en/language.oop5.anonymous.php) but this would complicate things. Just create a class to do your work, and hook that in. Why not? Commented Mar 20, 2022 at 13:09
  • Thank you for your fast reply. I didn't know the boilerplate doesn't support closures, thanks for the clarification. As for your suggestion, even if I created a dedicated class to replace the anonymous function, I don't see where I could pass arguments through the loader since their is no parameter where to pass them? Commented Mar 20, 2022 at 21:32
  • Do you mean I should create a class where I pass the arguments I want to pass, then call that class in the 2nd parameter of the loader (object) and then call a function name inside that class as a 3rd parameter of the loader (string)? Commented Mar 20, 2022 at 21:40