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<?php interface Foo {} interface Bar { /** * @return scalar|array|object|null */ public function __get(string $k); } function Baz(string $thing) : bool { return method_exists($thing, '__get'); } function Bat(string $thing) : bool { return (class_exists($thing) || interface_exists($thing)) && (new ReflectionClass($thing))->hasMethod('__get'); } var_dump(Baz(Foo::class), Bat(Foo::class), Baz(Bar::class), Bat(Bar::class));