public function to_legacy_objects(array $authors) : array {
        return array_map(function(author_entity $author) {
            return (object) [
                'id' => $author->get_id(),
                'picture' => $author->get_picture_item_id(),
                'firstname' => $author->get_first_name(),
                'lastname' => $author->get_last_name(),
                'fullname' => $author->get_full_name(),
                'email' => $author->get_email(),
                'middlename' => $author->get_middle_name(),
                'firstnamephonetic' => $author->get_first_name_phonetic(),
                'lastnamephonetic' => $author->get_last_name_phonetic(),
                'alternatename' => $author->get_alternate_name(),
                'imagealt' => $author->get_image_alt()
            ];
        }, $authors);
    }