Upgrade Site to PHP 8.1

My site is currently running on PHP 7.x, and I need it moved to PHP 8.1 without breaking anything that is already live. I am not certain whether the codebase relies on bespoke functions, third-party packages, or a mix of both, so I will need you to inspect the application first, flag any incompatibilities, then carry out the upgrade from start to finish. What I expect from you: • Perform a quick audit and list any 7.x-only functions, deprecated calls, or library conflicts. • Configure a staging environment, switch it to PHP 8.1, and resolve every compatibility warning or fatal error. • Run functional tests (or the site’s existing test suite, if present) until it is fully stable. • Deploy the updated code to production and verify that all front-end and back-end features work exactly as before. If you have recent experience upgrading legacy projects to PHP 8.1 and you can document the process clearly along the way, you are the person I need.

Project ID: 40488641