how to data in basecontroller.php pass to footer.php view codeigniter 4

Hmm. In CI 3 $this is "more global" as I recall.
For your last example, the function should return something (object).

PHP Code:

// in my_function(), example
return $this; 


I can’t guess anymore, expect others or try it yourself


thank you, too difficul in codeigniter 4, so simply, write in controller
stop here