PHP OPcache

When to use

• The user sees OPcache evictions, an out-of-memory cache, low hit rate, or stale code after a deploy, and needs to diagnose and fix it.
• The user wants to preload framework and hot application classes at server start so they are compiled once and shared across every request.
• The user is configuring OPcache for a production PHP-FPM app and needs the right memory, timestamp-validation, and interned-string settings.

When NOT to use