Executing opcache_reset is definitely a prerequisite for the watcher to work correctly. Otherwise the reloading logic will just be plain broken if opcache is enabled (which is the case on most php installations).
It would probably make more sense to just check if the function exists instead.

Executing opcache_reset is definitely a prerequisite for the watcher to work correctly.

Wouldn't that be part of the worker script though?

Wouldn't that be part of the worker script though?

Not necessarily, you would not want to call opcache_reset when the worker script restarts regularly, only when its restart was caused by the watcher.

Makes sense. I've updated this to conditionally check for opcache_reset.