public function add_artists($artists) { if (!is_array($artists)) { $artists = array($artists); } foreach ($artists as $artist) { if ($artist == "") { continue; } $exists = Artists::get_by_name($artist); if ($exists) { $exists->add_to_track($this); } else { $object = new Artist(); $object->set_name($artist); $object->add_to_track($this); } } }