How to render list of bytes into a QR-code

[justme26]

Hi,

How do I render a list of bytes into a QR-code?

This is my code:

<?php
use chillerlan\QRCode\{QRCode, QROptions};
use chillerlan\QRCode\Data\QRMatrix;
use chillerlan\QRCode\Common\EccLevel;

include_once('vendor/autoload.php');

$byte_array = array(65,66,67,177,178,68);

$options = new QROptions([
    'version'      => 40  
]);


echo '<img src="'.(new QRCode($options))->render($byte_array).'" alt="QR Code" />';

But chillerlan\QRCode\QRCode::render() only accepts strings so I am getting a Fatal Error.

How can I do this?

I want to save as many bytes as possible into one QR-code.

[codemasher]

Hey, I have recently added a method to the QR Code reader result class that does exactly this:

php-qrcode/src/Decoder/DecoderResult.php

Lines 90 to 96 in 7395795

	public function getMatrix():QRMatrix{
	return (new QRMatrix($this->version, $this->eccLevel, $this->maskPattern))
	->initFunctionalPatterns()
	->writeCodewords(new BitBuffer($this->rawBytes))
	->mask()
	;
	}

You can then invoke an output interface with the matrix like so:

$out = new QRMarkupSVG($options, $matrix);
$out->dump();

[justme26]

Sorry, I am a bit confused.... Is it possible to store 2953 bytes (or 2953*8 bits) in a single QR-code when using version 40?

[codemasher]

As per specification it is. https://www.qrcode.com/en/about/version.html
2952 bytes in binary mode, as the terminator consumes 4 bits at least and the data mode identifier another 4.

	(new QRCode)->render(str_repeat('#', 2952)); // 2953 will yield an error

[justme26]

Okay, thanks :) Can you tell me how to select binary mode?

[codemasher]

It's as simple as that (in dev-main/v5):

$qrcode = new QRCode($options);
$qrcode->addByteSegment($data);

$qrcode->render();

[codemasher]

The example before used the internal auto detection which will automatically switch to binary mode if no matching characters for numeric, alphanum or kanji are found.