Challenge 1 / 2

You want to catch every deprecation your app can trigger before upgrading, even the ones on pages you never click locally. What’s the most reliable plan?

Turn off deprecations in config so they stop showing up, then upgrade — no warnings means no problems.

Run PHPUnit; if it passes, that means you have zero deprecations.

Use the Web Debug Toolbar and click around the main pages — if you don’t see any, you’re good.

Deploy Symfony 7.4 for a while and log deprecations in production, then fix what shows up until the logs are clean.

Rewatch the video