string $post_type, WP_Post_Type $post_type_object )
Fires after a post type is registered.
Arguments used to register the post type.
We can register a custom post type with the register_post_type function. This should not be hooked before init. So, the good option is to call it with an init hook.
Post types can support any number of built-in core features such as meta boxes, custom fields, post thumbnails, post statuses, comments, and more. See the $supports the argument for a complete list of supported features.
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do_action( 'registered_post_type', $post_type, $post_type_object );