YAPHPO is "Yet Another PHP Obfuscator". Based on the program 'PHPCodeBuster' by Martijn Loots, YAPHPO adds constant obfuscation as well as selective obfuscation across the board. Consider YAPHPO to be more a 'framework' around PHPCodeBuster to provide customisable obfuscations, while still providing some core additions to PHPCodeBuster.