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<?php class Email { public function __construct( public string $value ) {} } class Message { public function __construct( private Email $recipient ) {} public function recipient(): Email { return $this->recipient; } } $address = new Email('foo@bar.com'); $message = new Message($address); var_dump($message); $message->recipient()->value = 'oops'; var_dump($message);
Output for git.master_jit, git.master
Warning: Module "Zend OPcache" is already loaded in Unknown on line 0 Warning: Zend OPcache: module registration failed! in Unknown on line 0 object(Message)#2 (1) { ["recipient":"Message":private]=> object(Email)#1 (1) { ["value"]=> string(11) "foo@bar.com" } } object(Message)#2 (1) { ["recipient":"Message":private]=> object(Email)#1 (1) { ["value"]=> string(4) "oops" } }

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