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A PHP QR Code generator and reader with a user-friendly API
chillerlan/php-qrcode is a modern, flexible PHP library for generating QR codes. It supports various customization options such as size, encoding, error correction, and logo embedding. The library is PSR-compliant and built for ease of use in modern PHP projects, making it suitable for generating QR codes in web apps, receipts, and authentication systems.
...There's a section to allow you to create a QR with some cmd code to simplify the unlock and even delete a file. You can keep concatenating with &&. The screenshots section should show you everything you need to start using it.
Crucially, this does not use any web api calls. It can run offline.
I'm not a coder so this isn't error handled anywhere near as well as it should. Source is in the files section.
Built on QRCoder by Raffael Herrmann, released under MIT license.
https://github.com/codebude/QRCode
PHP QR Code is open source (LGPL) library for generating QR Code, 2-dimensional barcode. Based on libqrencode C library, provides API for creating QR Code barcode images (PNG, JPEG thanks to GD2). Implemented purely in PHP.
QRMAN an open source Url Shortener and QR Code generator with excellent features. Create, Manage, track Qr codes. Excellent statistics for every QR codes.