Seeing as it has the following code sample I'm going to guess "not well". new PersonName($this->first_name, $this->last_name); I mean it could be doing sill

Seeing as it has the following code sample I'm going to guess "not well". new PersonName($this->first_name, $this->last_name); I mean it could be doing silly things like returning an empty last_name but why bother the user with two fields then?