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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!';
based on sWKeF
Output for 7.4.0 - 7.4.13, 8.0.0
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.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.24
Fatal error: Declaration of Httplug::sendRequest(Request $request) must be compatible with Psr::sendRequest(Request $request): Response in /in/MMCL3 on line 22
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Warning: Unsupported declare 'strict_types' in /in/MMCL3 on line 3 Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/MMCL3 on line 14
Process exited with code 255.