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<?php #[\Attribute] final class Attr1 {} #[\Attribute] final class Attr2 {} final class A { public function __construct( #[Attr1] #[Attr2] public string $a ) {} } $reflection = new \ReflectionClass(A::class); var_dump(array_keys($reflection->getConstructor()->getParameters()[0]->getAttributes(Attr2::class)));
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> int(0) }

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