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

In what situation is the template called without a controller?
If this is some private information output, it must be passed to the method.
Do you have a working use case?

in codeigniter 3, i only write code in  my_controller

view footer.php do like


$demo =$this->option ->myfunction();

echo $demo->site_name