What is the best way to protect php code from modifications?

Question

Encryption

Hello. There is a system written in php. I transfer this system to third parties for use. I need to protect the code from improvements in order to provide updates and my own improvements in the future.
I wanted to ask you about this, which php encryption system is currently the most stable? I am considering commercial and non-commercial options. I also wanted to know, After what time (at least approximately) will the encryption system be compromised and find a way to decrypt the code?

Answer 1

There was already a similar question How to protect php code from theft. What and how to encode? , I think zend is for you.

Answer 2

If you need to "protect from modifications", and not from copying, then IMHO it is enough to connect version control, and it will be seen whether some files have changed or not. I often have to do this if I let freelancers into the project who do not use version control themselves (after their edits, I do git status and see what exactly was corrected).