RE: [PHP-DEV] RFC: Protocol Type Hinting

>I agree the use-cases are slightly weak. This is a draft RFC. It's supposed to help >identify > the areas where we can improve it. Help identify use-cases. Help dig it out. I think Ralph has the right idea: register_compatible_types($yourType, $myType); A better name might be (only for interfaces): register_instanceof($compatibleInterface, $interface); e.g. class ThirdParty { static foo(LoggerInterface $log) {} } class Bar implements My_Logging_Inferface {} echo (Bar instanceof LoggerInterface); // false register_instanceof('My_Logging_Inferface', 'LoggerInterface'); echo (Bar instanceof LoggerInterface); // true ThirdParty::foo(new Bar); // no error since 'My_Logging_Interface' is compatible with LoggerInterface In summary, it would allow for user-land registration of compatible interfaces to third party libraries. There's definitely a couple of use cases where I would have liked to use something to this. Advantages to wrapping the feature in a function: - No extra syntax to support in core - No 'new concept' for developers to learn - It can be disabled (which OO purists might like) disable_functions = register_instanceof