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I hope you charge for it.

That said there are languages where very little backward incompatible changes are made. Java comes to mind.

Also: putting each client in a sandbox (VM, VPS, etc) can help you to keep some clients on the old versions, and/or do PHP interpreter migrations on your own timeline.

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> I hope you charge for it.

I do and appreciate the job security but I respect my clients (small biz owners) and it's just not satisfying and for the 10% that have issues, costly.

Don't update php and freeze the files and the database so they can't be hacked.

Sure, but what stops them from modifying the database?

> Java comes to mind.

Java used to be like that, but the migration to the module system has been very rocky for me personally when revisiting older projects.

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