Nette\Forms\Controls\ChoiceControl::getValue PHP Method

    public function getValue()
    {
        return array_key_exists($this->value, $this->items) ? $this->value : NULL;
    }

 /**
  * Returns selected radio value.
  * @return mixed
  */
 public function getValue($raw = FALSE)
 {
     if ($raw) {
         trigger_error(__METHOD__ . '(TRUE) is deprecated; use getRawValue() instead.', E_USER_DEPRECATED);
         return $this->getRawValue();
     }
     return parent::getValue();
 }