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<?php interface Constraint {} #[Attribute(Attribute::TARGET_PROPERTY|Attribute::TARGET_METHOD|Attribute::TARGET_PARAMETER)] class NotNull implements Constraint {} class App { #[NotNull] public function test(): void {} } foreach((new ReflectionMethod(App::class, 'test'))->getAttributes() as $attribute) if((new ReflectionClass($attribute->getName()))->implementsInterface(Constraint::class)) echo 'Success';
Output for git.master, git.master_jit, rfc.property-hooks
Success

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