If you have sensitive logic (like API keys or encryption algorithms), do not obfuscate it. Move it to a server-side API . Let your PHP script call the API to do the work. This keeps your proprietary logic completely off the user's machine.
Available on GitHub Marketplace, this modern obfuscator can be integrated into CI/CD pipelines and supports PHP 7.4 through 8.5. best php obfuscator
There are numerous free web-based utilities where you can paste your PHP code and get an immediate scrambled output. If you have sensitive logic (like API keys