I need a good encoder that does not require any additional software installed, works with php 4 and 5. Lets start with free ones if you know any Thanks
I'm assuming you mean a PHP encoder. Encoders require server side software installed. Admittedly, most hosts have the required extensions set up already, but they do require an extension. Alternatively, you can look at obfuscators: an obfuscator will 'reprogram' your code. That is to say, while the output is still normal, everyday PHP, it's without comments and all of the functions and variables and what not have meaningless names. So long as your code doesn't rely on register_globals being on and doesn't use things like variable variables and function callbacks you can usually get away with that. I have written an obfuscator called YAPHPO: you can find out more about it at http://www.asistechnologies.com/home/products/yaphpo/yaphpo-information.html . Now admittedly it's not as 'secure' as bytecode compiled code (as provided by the encoders) but it does do a pretty good job while being certain that nothing 'special' is required server side.