Unable to point the child theme directory even using get_stylesheet_directory()

Question

I am developing a child theme based on storefront as parent theme. I am trying to include files in child theme functions.php file as:

require_once get_stylesheet_directory() . '/inc/_customizer.php';
require_once get_stylesheet_directory() . '/inc/_header.php';

When I move any function from functions.php file to _header.php or _cuztomizer.php files which are in the inc folder in the child theme it does't works but either in functions.php file it works very well. I don't know what I am doing wrong and how I can include files in function.php file.

Please help me. Thank you in advance

Answer 1

The answers to this question state that require_once operates at a file-system level. I would try

include get_stylesheet_directory() . '/inc/_customizer.php';

try to change require_once with include and see if that works. If it does, you can research how to use require_once correctly at your leisure.