protected function outputConv(string $str): string
    {
        if ($str === '') {
            return '';
        }

        return \iconv('UTF-32', $this->encoding, static::$utf32Header . $str);
    }
protected function outputConv(string $str): string
    {
        if ($str === '') {
            return '';
        }

        return \iconv('UTF-32', $this->encoding, static::$utf32Header . $str);
    }
protected function outputConv ( string $ str ) : string { if ( $ str === '' ) { return '' ; } return \ iconv ( 'UTF-32' , $ this -> encoding , static :: $ utf32Header . $ str ) ; }
convert the output string to its original encoding
convert the output string to its original encoding