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In PHP, call_user_func(array(self, 'method_name')) doesn’t work. The self keyword cannot be used in that context. I need to actually include the name of the class call_user_func(array('class_name', 'method_name')).
However, if I’m not in a static function, the $this variable does work in that context. Why the difference?
If you want the name of the current class context, use get_class() (without any parameters) or __CLASS__.
You’ve already written the difference; self is a keyword, and is not usable as a reference in an array (what kind of type should that be in PHP?). get_class() returns a string, and the array()-callback supports using a string as the first name to do a static call.