    public static function mb_internal_encoding($encoding = null)
    {
        if (null === $encoding) {
            return self::$internalEncoding;
        }

        $encoding = self::getEncoding($encoding);

        if ('UTF-8' === $encoding || false !== @iconv($encoding, $encoding, ' ')) {
            self::$internalEncoding = $encoding;

            return true;
        }

        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.