PHPQRCode is open source (LGPL) library for generating QRCode, 2-dimensional barcode. Based on libqrencode C library, provides API for creating QRCode barcode images (PNG, JPEG thanks to GD2). Implemented purely in PHP.
Programming allows separate design.
Example showing how design separates the code and PHPscript for lenguaje as is done with dotNET architecture that separates into aspx and cs or vbs but now with PHP.