 <p>You can compare the php bytecode with bytekit-cli <a href="http://sebastian-bergmann.de/archives/871-bytekit-cli.html" rel="nofollow">(blogpost)</a> / <a href="https://github.com/sebastianbergmann/bytekit-cli" rel="nofollow">(github project)</a>.</p> <p>To see if your new and old code produces the same php-bytecode. Knowing that you can be pretty sure everything will work. (If you are using annotations i'm not to sure how that works out with that)</p>