I paid for some commercial PHP code that’s licensed on a per-site basis (yes, it was cheaper than writing and debugging it myself). Amusingly the code is obfuscated. Looking in the file reveals
Which I’m guessing wouldn’t really be that hard to decode.
Update – Having looked at the uncompressed base64_decoded code, it seems that this is a good way to wrap PHP code containing UTF-16 or high-ASCII characters so that it survives various editors etc.