RichardMisencik on "Is register_post_type called only in admin?"

Is register_post_type function only called in admin?

I have several custom post types, each in a separate file like cpt-books.php, cpt-movies.php etc. Besides just register_post_type I have code to add metaboxes etc. for each post type.

Then in functions.php I'm requiring these files like so:

require_once('cpt-books.php');
require_once('cpt-movies.php');
...

Can I do it this way? So these files are only loaded in the admin and not on the front end?

if(is_admin()) {
require_once('cpt-books.php');
require_once('cpt-movies.php');
...
}

Is it going to work properly? Or