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.
Class Integration allows easy save/load of data, also helps you to avoid creating lots of methods to access variable members. (CallStack) Provides "multithread debug info on error" funcionalities to your program. (String) Easy access to terminal colors