public function getSetValuesBase(array &$values): void
  {
    if ($this->name==='')
    {
      $tmp = &$values;
    }
    else
    {
      $values[$this->name] = [];
      $tmp                 = &$values[$this->name];
    }

    foreach ($this->options as $i => $option)
    {
      // Get the (database) ID of the option.
      $key = $option[$this->keyKey];

      // Get the original value (i.e. the option is checked or not).
      $tmp[$key] = (!empty($option[$this->checkedKey]));
    }
  }