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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 8.2.21 - 8.2.29, 8.3.5 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
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.
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.1.30 - 8.1.33
Parse error: syntax error, unexpected token "readonly", expecting end of file in /in/hkTDp on line 3
Process exited with code 255.
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