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A PHP RFC (targeting PHP 8.6) proposes two closure optimizations: automatic static inference for closures that don't use `$this`, and caching of stateless closures between uses. The static inference eliminates implicit reference cycles between closures and their parent objects, reducing garbage collection pressure. Closure caching avoids redundant instantiation of identical stateless closures. Benchmarks show ~80% improvement in synthetic tests and ~3% in Laravel templates. Three backward-incompatible changes are noted: `ReflectionFunction::getClosureThis()` may return NULL for inferred-static closures, identical stateless closures from the same location will now be the same object, and objects in cycles may be destructed earlier. The RFC is currently in voting.

PHP: rfc:closure-optimizations

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