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Asked: 2026-06-17T15:05:53+00:00

At the moment I am generating a barcode using Shay Anderson’s class (http://www.shayanderson.com/php/php-barcode-generator-class-code-39.htm) and

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At the moment I am generating a barcode using Shay Anderson’s class (http://www.shayanderson.com/php/php-barcode-generator-class-code-39.htm) and I am able to successfully display the generated barcode in the browser as follows:

$bc = new PrintBarcode('DARP CODE');
$bc->drawVoucher();
$src = $bc->getVoucher();

// Output and free from memory
header('Content-Type: image/jpeg');
imagejpeg($src);

but now I am trying to modify my script to overlay the barcode on top of another image to create a voucher but I can’t seem to get it to work, I just get the broken image icon in Chrome and the following warning in the console:

Resource interpreted as Document but transferred with MIME type image/jpeg

$bc = new PrintBarcode('DARP CODE');
$bc->drawVoucher();
$src = $bc->getVoucher();

header('Content-Type: image/jpeg');

// create actual voucher with barcode overlayed on voucher background 
$bg  = imagecreatefromjpeg('images/voucher.jpg');

imagecopymerge($bg, $src, 0, 0, 0, 0, imagesx($bg), imagesy($bg), 75);

imagejpeg($bg, null, 100);

imagedestroy($bg);

Error reporting is on and I’m getting no wanrings, notices or fatal errors. Any help appreciated.

The only thing I can think of is that from the docs of the barcode class, it generates the barcode as a gif so not sure if I am missing a few steps.

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1 Answer

  1. Editorial Team

    Turns out the problem was to do with the image I was using as the basis of the merge wasn’t quite right so I re-converted it from a png to jpg properly (first time I downloaded the png I simply did a save as all files to jpeg) using photoshop and it was fine, to clarify, here’s the code:

    $bc = new PrintBarcode('DARP CODE');
$bc->drawVoucher();
$src = $bc->getVoucher();

header('Content-Type: image/jpeg');

$bg  = imagecreatefromjpeg('images/voucher.jpg');

imagecopymerge($bg, $src, 40, 380, 0, 0, imagesx($bg), imagesy($bg), 100);

imagejpeg($bg, null, 100);

imagedestroy($src);
imagedestroy($bg);
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