    public static function html()
    {
        new self();
        $html = '<div class="form-group">
            <div class="g-recaptcha" data-sitekey="'.self::$key.'"></div></div>
            <script type="text/javascript"
                    src="https://www.google.com/recaptcha/api.js?hl='.self::$lang.'" async defer>
            </script>';
        if (self::isEnable()) {
            return $html;
        } else {
            return '';
        }
    }
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.