<?php declare(strict_types=1); class R { function isError(): bool { return true; } } class S { function doSomething($input): R { return new R; } } function needBool(bool $b) { var_dump($b); } $input = "str"; $service = new S; $shouldStop = ($result = $service->doSomething($input)) && $result->isError(); needBool($shouldStop);
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