Stdlib: ReflectionMethod::createFromClosure() / ReflectionFunction::createFromCallable() — static factories missing (php_reflection.c)

[PurHur]

Category

stdlib / reflection (php-src-strict)

Problem

PHP 8.1+ reflection factories for closures/callables are missing:

• ReflectionFunction::createFromCallable(callable $callback)
• ReflectionMethod::createFromClosure(Closure $closure, ?string $scope = null, ?string $name = null)

Without these, introspection of first-class callables and Closure objects cannot match Zend tooling.

php-src reference

• php/php-src ext/reflection/php_reflection.c — ReflectionFunction::createFromCallable, ReflectionMethod::createFromClosure

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php -r "var_dump(method_exists(\"ReflectionFunction\", \"createFromCallable\"));"  # false
php bin/vm.php -r "var_dump(method_exists(\"ReflectionMethod\", \"createFromClosure\"));"    # false
php bin/vm.php test/repro/maintainer_reflection_create_from_callable.php                      # Error: missing
php -r "\$fn = fn() => 42; echo ReflectionFunction::createFromCallable(\$fn)->invoke();"       # Zend: 42
'

Scope (this repo)

Path	Work
Reflection builtin handlers	Register both static factories
lib/VM/	Map Closure/callable zvals to reflection objects
Tests	compliance .phpt for closure + invokable object callbacks

Implement in ext/ + lib/VM/ — reuse existing ReflectionFunction/ReflectionMethod classes.

Done when

• Both methods exist and repro prints 42
• Invalid/non-closure callables throw ReflectionException/TypeError per Zend
• createFromClosure honors optional $scope / $name for bound closures

Related

• Stdlib: ReflectionMethod::createFromMethod() — static factory missing (ext/reflection/php_reflection.c) #7038 (createFromMethod) · Stdlib: ReflectionMethod::getClosure() — instance method to Closure missing (ext/reflection/php_reflection.c) #6663 getClosure · Stdlib: Closure::fromCallable([enumCase, method]) — must invoke case method (zend_closures.c) #5721 enum case Closure::fromCallable · Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492