public function writeString(
        string $content,
        string $encoding = Encoder::DEFAULT_BYTE_MODE_ECODING,
        ?ErrorCorrectionLevel $ecLevel = null
    ) : string {
        if (strlen($content) === 0) {
            throw new InvalidArgumentException('Found empty contents');
        }

        if (null === $ecLevel) {
            $ecLevel = ErrorCorrectionLevel::L();
        }

        return $this->renderer->render(Encoder::encode($content, $ecLevel, $encoding));
    }
public function writeString(
        string $content,
        string $encoding = Encoder::DEFAULT_BYTE_MODE_ECODING,
        ?ErrorCorrectionLevel $ecLevel = null
    ) : string {
        if (strlen($content) === 0) {
            throw new InvalidArgumentException('Found empty contents');
        }

        if (null === $ecLevel) {
            $ecLevel = ErrorCorrectionLevel::L();
        }

        return $this->renderer->render(Encoder::encode($content, $ecLevel, $encoding));
    }
public function writeString ( string $ content , string $ encoding = Encoder :: DEFAULT_BYTE_MODE_ECODING , ? ErrorCorrectionLevel $ ecLevel = null ) : string { if ( strlen ( $ content ) === 0 ) { throw new InvalidArgumentException ( 'Found empty contents' ) ; } if ( null === $ ecLevel ) { $ ecLevel = ErrorCorrectionLevel :: L ( ) ; } return $ this -> renderer -> render ( Encoder :: encode ( $ content , $ ecLevel , $ encoding ) ) ; }
Writes QR code and returns it as string.

Content is a string which *should* be encoded in UTF-8, in case there are
non ASCII-characters present.

@throws InvalidArgumentException if the content is empty
Writes QR code and returns it as string .