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<?php class MyDTO{ public ?int $propA; public ?int $propB; } $dto = new MyDTO(); $dto->propA = null; echo (new ReflectionProperty(MyDTO::class, 'propB'))->isInitialized($dto) ? 'init' : 'no-init';
Output for git.master, git.master_jit, rfc.property-hooks
no-init

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