    public static function existConf () {

        if(file_exists(GX_PATH.'/inc/config/config.php')){

            return true;

        }else{

            return false;

        }
    }

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.