/**
  * get all fields values
  * @return array|mixed|null|void
  */
 public function get_values()
 {
     if (!empty($this->tab)) {
         $fields = HW_HOANGWEB_Settings::get_field_value($this->tab['section_id']);
         return $fields;
     }
     $values = HW_HOANGWEB_Settings::get_values();
     return $this->pure_fields_result($values);
 }