Online PHP editor | output for h6IYF

<?php try { function hello_1(?string $whom): ?string { if ($whom !== null) { return "Hello $whom"; } } var_dump(hello_1(null)); } catch (\Error $e) { echo $e->getMessage() . PHP_EOL; } /*try { function hello_2(?string $whom): ?string { if ($whom !== null) { return "Hello $whom"; } return; } var_dump(hello_2(null)); } catch (\Error $e) { echo $e->getMessage() . PHP_EOL; } Fatal error: A function with return type must return a value (did you mean "return null;" instead of "return;"?) in /in/QRj2G on line 20 */ try { function hello_3(?string $whom): ?string { if ($whom !== null) { return "Hello $whom"; } return null; } var_dump(hello_3(null)); } catch (\Error $e) { echo $e->getMessage() . PHP_EOL; }