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<?php enum Marker {} #[Marker] class C {} class D {} function has_marker(string $class) { return !empty((new ReflectionClass($class))->getAttributes(Marker::class)); } var_dump(has_marker(C::class)); var_dump(has_marker(D::class));
Output for 8.1.34, 8.2.29 - 8.2.31, 8.3.5 - 8.3.32, 8.4.8 - 8.4.23, 8.5.0 - 8.5.8
bool(true) bool(false)

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