name = $name == "" ? null : $name; } public function has_name() : bool { return $this->name != null; } public function get_name() : string { return $this->name != null ? $this->name : "null"; } //Get and set the number of members of the group public function set_number_members(int $number_members){ $this->number_members = $number_members; } public function has_number_members() : bool { return $this->number_members > -1; } public function get_number_members() : int { return $this->number_members; } }