PHPMailer::encodeString( string $str, string $encoding = self::ENCODING_BASE64 ): string

3676    public function encodeString($str, $encoding = self::ENCODING_BASE64)3677    {3678        $encoded = '';3679        switch (strtolower($encoding)) {3680            case static::ENCODING_BASE64:3681                $encoded = chunk_split(3682                    base64_encode($str),3683                    static::STD_LINE_LENGTH,3684                    static::$LE3685                );3686                break;3687            case static::ENCODING_7BIT:3688            case static::ENCODING_8BIT:3689                $encoded = static::normalizeBreaks($str);3690                //Make sure it ends with a line break3691                if (substr($encoded, -(strlen(static::$LE))) !== static::$LE) {3692                    $encoded .= static::$LE;3693                }3694                break;3695            case static::ENCODING_BINARY:3696                $encoded = $str;3697                break;3698            case static::ENCODING_QUOTED_PRINTABLE:3699                $encoded = $this->encodeQP($str);3700                break;3701            default:3702                $this->setError(self::lang('encoding') . $encoding);3703                if ($this->exceptions) {3704                    throw new Exception(self::lang('encoding') . $encoding);3705                }3706                break;3707        }3708 3709        return $encoded;3710    }