Simple QR-Code library for PHP

Question

My question is pretty close to QR Code Generator Library (no web service) – just for PHP instead of .NET: I want a small, light-weight PHP "library" (ideally a compact class) to generate QR Codes, mostly for texts. It shall not use any web services, but generate the codes on-site.

Requirements

• free and open source (FOSS/FLOSS)
• small and light-weight (ideally a single class file with max 50kiB)
• the "simple" from the title meaning: install via copy-the-file(s) must be possible – not e.g. requiring composer with 10 dependencies. Best no dependencies at all (except for "built-in"/ships-with-PHP, like php-gd to create/manipulate graphics)
• not using web services (local generation; can use e.g. php-gd to generate images)
• supports at least encoding text and URLs
• supports at least PHP 7+

Nice to have (but not strictly required)

• supporting other types, like VCards, calendar entries
• embedding logos (to make a QR code easier to identify visibly)
• setting foreground/background colors (if not possible, black on white is OK)
• setting size (could be done afterwards – but it's easier if supported directly)
• small resulting file size
• actively maintained (so support for future PHP versions has a chance)
• available at Github, GitLab or Codeberg, ideally incl. issue tracker (for support, feedback and possible contributions)

Not needed

• fancy stuff like crazy coloring or rotating QR cubes with sound (you know what I mean: KISS principle)

Answer 1

There are many libraries to perform such a task. Here's the ones that caught my attention:

php-qrcode: simple, but supports many options:

echo '<img src="'.(new QRCode)->render("hello world").'" />';

qr-code: same:

use Endroid\QrCode\QrCode;
$qrCode = new QrCode('Life is too short to be generating QR codes');
header('Content-Type: '.$qrCode->getContentType());
echo $qrCode->writeString();

phpqrcode: open source library, based on libqrencode.

<?php 
include('qrlib.php'); 
// outputs image directly into browser, as PNG stream 
QRcode::png('hello world');