/**
*
* function val - This function checks if the value valid if isn't throw an exception.
*
* @param null $val
* @return void
* @throws \SimplOn\DataValidationException
*/
public function val($val = null)
{
if ($val) {
if (in_array($val, $this->options)) {
parent::val($val);
} else {
throw new \SimplOn\DataValidationException($this->valudationNotAnOption);
}
} else {
return $this->val;
}
}
