I will second that it isn't very painful at all. Longevity is one of the strengths of PHP, it is not hard to find continuously operational PHP codebases that ar

I will second that it isn't very painful at all. Longevity is one of the strengths of PHP, it is not hard to find continuously operational PHP codebases that are 15 or more years old. Those codebases are often hideous but they've been getting stuff done, and that's admirable. Generally when updating a codebase like that, it's important to also make sure that passwords are being stored securely, SQL queries are using prepared statements, and XSS/CSRF protections are in place, and a protocol is set up for keeping up with new PHP versions. Then hopefully it will be ready to go back to minimum maintenance mode for some more years.