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<?php readonly class Email { public function __construct(public string $emailString){} public function __toString() {return trim($this->emailString);} } readonly class ValidEmail extends Email {} function validateEmail(Email $email): ValidEmail {return new ValidEmail($email);} function saveToDatabase(ValidEmail $email) {return 'Saved succesfully';} $email = new Email('vasya@pupkin.com'); $validatedEmail = validateEmail($email); var_dump(saveToDatabase($validatedEmail)); var_dump(saveToDatabase($email));
Output for git.master_jit, git.master
string(17) "Saved succesfully" Fatal error: Uncaught TypeError: saveToDatabase(): Argument #1 ($email) must be of type ValidEmail, Email given, called in /in/hkTDp on line 17 and defined in /in/hkTDp:11 Stack trace: #0 /in/hkTDp(17): saveToDatabase(Object(Email)) #1 {main} thrown in /in/hkTDp on line 11
Process exited with code 255.

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