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Instantly convert between number systems and do basic operations
...Additionally, bitwise and numeric operations can be performed on the main value (also of arbitrary size).
The main feature is the visual buttons representing the appropriate bit value, which can show and change the respective bit position. Also, bit group values (eg. W0, H0, etc) can be displayed.
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.