3v4l.org

run code in 300+ PHP versions simultaneously
<?php class AbstractProvider { } class GenericProvider extends AbstractProvider { } interface Oauth2ClientPluginInterface { public function getProvider(): GenericProvider; } class OAuth2ClientPluginBase implements Oauth2ClientPluginInterface { public function getProvider(): AbstractProvider { } } class Oauuth2Plugin extends OAuth2ClientPluginBase { public function getProvider(): GenericProvider { } }
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.14
Fatal error: Declaration of OAuth2ClientPluginBase::getProvider(): AbstractProvider must be compatible with Oauth2ClientPluginInterface::getProvider(): GenericProvider in /in/43cFO on line 17
Process exited with code 255.
preferences:
59.53 ms | 406 KiB | 5 Q