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<?php // It seems instanceof only supports checking for directly implemented interfaces, not inherited ones: interface FooBarInterface { } class Bar implements FooBarInterface { } class Foo extends Bar { } $className = Foo::class; var_dump($className instanceof FooBarInterface); var_dump(is_subclass_of($className, FooBarInterface::class)); var_dump(class_implements($className));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(true) array(1) { ["FooBarInterface"]=> string(15) "FooBarInterface" }

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