    public static function footer($vars = '')
    {
        global $GLOBALS;
        if (isset($vars)) {
            # code...
            $GLOBALS['data'] = $vars;
            self::theme('footer', $vars);
        } else {
            self::theme('footer');
        }
    }
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.