an add_action to auto-assign secondary role?

Would it be possible to use an “add_action” code snippet to have users automatically assigned a secondary role upon a certain action?

I’ve got an add_action that assigns a role upon adding or changing a membership level, and I’d like to be able change that to assign a secondary role upon adding or changing a membership level.

Here’s the code I’m using successfully to assign a role:

<?php add_action( 'ms_model_relationship_create_ms_relationship_before', 'ms_controller_member_assign_memberships_done_cb', 99, 4 );
function ms_controller_member_assign_memberships_done_cb( $membership_id, $user_id, $gateway_id, $move_from_id ) {
	$user = new WP_User( $user_id );
	switch( $membership_id ){
		case 280:
			$user->set_role( 'client' );
			break;
		case 330:
			$user->set_role( 'ward_client' );
			break;
	}
}

Could this be altered to do secondary roles instead (or in addition to)?

Thanks,
Scott

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