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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 8.0.0 - 8.0.27, 8.1.0 - 8.1.15, 8.2.0 - 8.2.2
42 isnt a string stdClass cant be strung
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Parse error: syntax error, unexpected '|', expecting variable (T_VARIABLE) in /in/DlBh4 on line 13
Process exited with code 255.

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