bp_groups_process_group_type_update( int $group_id )

function bp_groups_process_group_type_update( $group_id ) {
	if ( ! isset( $_POST['bp-group-type-nonce'] ) ) {
		return;
	}

	check_admin_referer( 'bp-group-type-change-' . $group_id, 'bp-group-type-nonce' );

	// Permission check.
	if ( ! bp_current_user_can( 'bp_moderate' ) ) {
		return;
	}

	$group_types = ! empty( $_POST['bp-groups-group-type'] ) ? wp_unslash( $_POST['bp-groups-group-type'] ) : array();

	/*
	 * If an invalid group type is passed, someone's doing something
	 * fishy with the POST request, so we can fail silently.
	 */
	if ( bp_groups_set_group_type( $group_id, $group_types ) ) {
		// @todo Success messages can't be posted because other stuff happens on the page load.
	}
}