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<?php class Request {} class Route {} // Before: docs only: array|string|\Stringable|null /* interface FooInterface { public function getTitle(Request $request, Route $route); } */ // If we use native typehints instead interface FooInterface { public function getTitle(Request $request, Route $route): null|array|string|\Stringable; } // This is an implementation written against the original, i.e. with no return types specified. We should not break it. class SomeFoo implements FooInterface { public function getTitle(Request $request, Route $route) { return 'yay'; } } $test = new SomeFoo(); var_dump($test->getTitle(new Request(), new Route()));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of SomeFoo::getTitle(Request $request, Route $route) must be compatible with FooInterface::getTitle(Request $request, Route $route): Stringable|array|string|null in /in/WYop7 on line 18
Process exited with code 255.

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