Unlike languages like asp.net, php compiles on the fly. Meaning the source files have to be uploaded to the server for it to work. Unfortunately, there is no way to compile PHP then put it on a server, but there are programs that encrypt the code. The code is still being compiled on the fly, but it has to pass though a decrypter before it does so.

Another way would be to write most of it in C++ then call it as a custom extension in PHP. That way the source you dotn really want revealed is in a binary file.

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