PHP 7.4 is hitting end-of-life, and a huge share of production PHP still runs on it — but most 7.x -> 8.x writing is about "what's new," not "how to actually get there without breaking your app." This talk is the field-tested survival guide from migrating a large, real production monolith.

A repeatable, low-fear migration plan: blind spots to check for, a diffing-based safety net to catch them, and a rollout + rollback playbook they can adapt to their own stack.