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<?php declare(strict_types=1); class CanBeStrung { public function __toString(): string { return 'I\'m highly strung'; } } function isItStringy(string|Stringable $possibleStringType): bool { return true; } assert(isItStringy('a string') === true); assert(isItStringy(new CanBeStrung()) === true); try { assert(isItStringy(42) === false); } catch (TypeError $e) { echo '42 isnt a string' . PHP_EOL; } try { assert(isItStringy(new stdClass()) === false); } catch (TypeError $e) { echo 'stdClass cant be strung' . PHP_EOL; }
Output for git.master, git.master_jit, rfc.literals
42 isnt a string stdClass cant be strung

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