Mike42\Escpos\CapabilityProfile::getSupportsQrCode PHP Method

    public function getSupportsQrCode()
    {
        return $this->getFeature('qrCode') === true;
    }

 /**
  * Print the given data as a QR code on the printer.
  *
  * @param string $content The content of the code. Numeric data will be more efficiently compacted.
  * @param int $ec Error-correction level to use. One of Printer::QR_ECLEVEL_L (default), Printer::QR_ECLEVEL_M, Printer::QR_ECLEVEL_Q or Printer::QR_ECLEVEL_H. Higher error correction results in a less compact code.
  * @param int $size Pixel size to use. Must be 1-16 (default 3)
  * @param int $model QR code model to use. Must be one of Printer::QR_MODEL_1, Printer::QR_MODEL_2 (default) or Printer::QR_MICRO (not supported by all printers).
  */
 public function qrCode($content, $ec = Printer::QR_ECLEVEL_L, $size = 3, $model = Printer::QR_MODEL_2)
 {
     self::validateString($content, __FUNCTION__);
     self::validateInteger($ec, 0, 3, __FUNCTION__);
     self::validateInteger($size, 1, 16, __FUNCTION__);
     self::validateInteger($model, 1, 3, __FUNCTION__);
     if ($content == "") {
         return;
     }
     if (!$this->profile->getSupportsQrCode()) {
         // TODO use software rendering via phpqrcode instead
         throw new Exception("QR codes are not supported on your printer.");
     }
     $cn = '1';
     // Code type for QR code
     // Select model: 1, 2 or micro.
     $this->wrapperSend2dCodeData(chr(65), $cn, chr(48 + $model) . chr(0));
     // Set dot size.
     $this->wrapperSend2dCodeData(chr(67), $cn, chr($size));
     // Set error correction level: L, M, Q, or H
     $this->wrapperSend2dCodeData(chr(69), $cn, chr(48 + $ec));
     // Send content & print
     $this->wrapperSend2dCodeData(chr(80), $cn, $content, '0');
     $this->wrapperSend2dCodeData(chr(81), $cn, '', '0');
 }