How do I use a class method as a callback function?

Question

If I use array_walk inside a class function to call another function of the same class

class user
{
   public function getUserFields($userIdsArr         


        

Answer 1

If you need to call a static method without instantiating the class you could do so:

// since PHP 5.3
array_walk($fieldsArray, 'self::test_print');

Or from outside:

// since PHP 5.5
array_walk($fieldsArray, User::class.'::test_print');