A PHP internals mailing list discussion about a proposed RFC for OPcache Static Cache — an OPcache-managed shared-memory cache for userland values and PHP static state. The RFC introduces volatile and persistent backends with new functions (volatile_*/persistent_*) and attributes (#[OPcache\VolatileStatic] and #[OPcache\PersistentStatic]) that allow static properties and method static variables to survive across requests. Key discussion points include API design concerns (lock symmetry, atomic decrement behavior, status API returning objects vs arrays), the default-off setting and its impact on library adoption, shared-hosting tenant isolation challenges, key-space collision risks between libraries, and serialization behavior. The RFC author (Go Kudo) responded with several API improvements including unlock functions, lease-based lock expiry, and granular cache entry deletion.
