如何从 html 响应 PHP 在 qrcode tcpdf 的中心设置徽标？

Question

I am using TCPDF library to generate pdf file using PHP. They also have feature to create qrcode.

This is my syntax

$style = array(
    'border' => 0,
    'vpadding' => 'auto',
    'hpadding' => 'auto',
    'fgcolor' => array(0, 0, 0),
    'bgcolor' => false, //array(255,255,255)
    'module_width' => 1, // width of a single module in points
    'module_height' => 1 // height of a single module in points
 );

$this->cetak->AddPage('P', 'A4');
$this->cetak->write2DBarcode("aaaaa", 'QRCODE,L', 155, $this->cetak->getY(), 30, 30, $style);
$this->cetak->Output('PKKPR.pdf', 'I');
die;

This is the output.

For html output qrcode, i am using this code.

    $barcodeobj = new TCPDF2DBarcode('http://www.tcpdf.org', 'QRCODE,H');
    print_r($barcodeobj->getBarcodeHTML(3, 3, 'black'));
    die;

This is the output.

How to make the logo inside the middle of qrcode? I tried to search for documentation but couldn't find about that. Is it even possible to set logo on the center of the qrcode?

Answer 1

I may stand corrected here, but I don't think the TCPDF barcode API can embed logos into QR codes. I recommend using the endroid/qr-code library.

Build your QR code as per the examples, then embed the result into your PDF using a base 64 encoded data URI, something like this

use Endroid\QrCode\QrCode;

// Compile your QR code
$qr = QrCode::create('Data');

// Render to data URI
$data = $qr->getDataUri();

// Add to PDF page (WriteHTML example)
$pdf->writeHTML("<img src=\"$data\" width=\"200\" height=\"200\">");

Answer 2

If you have the GD library (which it looks like you do), roll your own logo/qr combo using getBarcodePNGData() , and applying your logo on top of it using imagecopymerge

$barcodeObj = new TCPDF2DBarcode('http://www.tcpdf.org', 'QRCODE,H');
$qrCode = $barcodeObj->getBarcodePNGData(3, 3, 'black');
$logo = imagecreatefrompng('logo.png');

//center in qr code
$logoX =  imagesx($qrCode)/2 - imagesx($logo)/2;
$logoY =  imagesy($qrCode)/2 - imagesy($logo)/2;

imagecopymerge($qrCode, $logo, 0, 0, $logoX, $logoY, imagesx($qrCode), imagesy($qrCode), 75);

imagepng($qrCode, null, 100); // this will stream the image out directly
 

Answer 3

If you use endroid/qr-code library as "Prof" suggest above you can also use $pdf->Image from data stream:

// Render to data as string
$data = $qr->getString();

// The '@' character is used to indicate that follows an image data stream and not an image file name
$pdf->Image('@'.$data);