public static function __static()
 {
     self::$questions = QuestionCaptchaConfig::load()->get_questions();
 }
 private function save()
 {
     $this->config->set_questions($this->form->get_value('questions'));
     QuestionCaptchaConfig::save();
 }
 public function __construct()
 {
     $this->case_sensitive = QuestionCaptchaConfig::load()->is_case_sensitive();
 }