Checking code for PHP 8.1.6 compatibility before upgrade

[email protected] (Ian Evans)
Newsgroups php.general
Message-ID <CABiY0=h1PK91aaZNBMPV6VKr6ZKP7ZcTxtdnOg86VtXq7J0UFA@mail.gmail.com> 
Long story short, due to some health issues in the past few years, I am WAY
behind in upgrading my server and PHP. Still running php 5.5.9!

Is there a script that can "lint" my code and tell me what is completely
broken if I move to 8.1 and what can wait for a weekend and a pot of
coffee? And if so, can that script be run on a 5.5.9 system or do I need to
spin up a cheap VPS with 8.1 and run it against the code there?

Thanks for any advice.
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