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<?php declare(strict_types=1); interface Response {} interface Request {} class RespImpl implements Response {} class ReqImpl implements Request {} interface Psr { public function sendRequest(Request $request): Response; } interface Httplug { public function sendRequest(Request $request); } //interface PsrBridge extends Psr, Httplug {} // does work interface PsrBridge extends Httplug, Psr {} // does not work class HttpClient implements PsrBridge { public function sendRequest(Request $request): Response { return new RespImpl(); } } $client = new HttpClient(); $response = $client->sendRequest(new ReqImpl()); echo $response instanceof Response ? 'OK' : 'Fail!';
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of Httplug::sendRequest(Request $request) must be compatible with Psr::sendRequest(Request $request): Response in /in/MMCL3 on line 18
Process exited with code 255.

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