PHP library for generating two-dimensional barcodes

 PHP QR Code is a library for generating QR Codes, 2-dimensional barcodes.
 It is based on the libqrencode C library and provides an API for creating
 QR Code barcode images (PNG and JPEG).
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 Some of the library features include:
  * Supports QR Code versions (size) 1-40
  * Numeric, Alphanumeric, 8-bit and Kanji encoding.
  * Exports to PNG, JPEG images, also exports as bit-table
  * TCPDF 2-D barcode API integration
  * Easy to configure
  * Data cache for calculation speed-up
  * Debug data dump, error logging, time benchmarking