If you only need to prevent casual users from tweaking code and do not want to force your clients to install server extensions, you can use modern open-source CLI obfuscators like or Yakpro-po (Yet Another PHP Obfuscator). These tools handle modern PHP syntax and strip comments and whitespace while renaming variables to unreadable strings. Best Practices for Protecting PHP Applications
The Ultimate Guide to PHP LockIt: Protect Your Source Code from Prying Eyes php lockit download
: It is primarily found on software archival or download mirrors like Software Informer . If you only need to prevent casual users