apply_filters( 'editable_roles', array[] $all_roles )

More Information

editable_roles is a filter applied by the function get_editable_roles() to the list of roles that one user can assign to others (a user must have the edit_users capability to change another user’s role). This list is displayed in the bulk operations (if the user has the list_users and promote_users) of the Users Screen, and on the profile screen.