    public static function opt($var) {
        $opt = self::$opt;
        if (key_exists($var,$opt)) {
            if ($var == 'mdo_adsense') {
                return self::isAdsense($opt[$var]);
            } else {
                return urldecode(self::$opt[$var]);
            }
        }
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.