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<?php interface ConfigurationProvider { public function getConfig() : array; } final class ConfigurationProviderImplementing implements ConfigurationProvider { public function getConfig() { return []; } } $provider = new ConfigurationProviderNonImplementing(); var_dump(! $provider instanceof ConfigProviderInterface && ! is_callable([$provider, 'getConfig']));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of ConfigurationProviderImplementing::getConfig() must be compatible with ConfigurationProvider::getConfig(): array in /in/4ic0H on line 10
Process exited with code 255.

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