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<?php class Foo {}; class Bar extends Foo {}; $reflection_foo = new ReflectionClass(Foo::class); $testClass = function($class) use ($reflection_foo) { $reflection = new ReflectionClass($class); return $reflection->isSubclassOf(Foo::class) || ($reflection->getName() == $reflection_Foo->getName()); }; var_dump($testClass(Foo::class), $testClass(Bar::class));