Contao\CheckBox::validate PHP Метод

    public function validate()
    {
        $varValue = $this->getPost($this->strName);
        if (!empty($varValue) && !$this->isValidOption($varValue)) {
            $this->addError(sprintf($GLOBALS['TL_LANG']['ERR']['invalid'], is_array($varValue) ? implode(', ', $varValue) : $varValue));
        }
        parent::validate();
    }