note 124654 added to migration74.new-features

It should be noted that typed properties internally are never initialized to a default null. Unless of course you initialize them to null yourself. That's why you will always going to encounter this error if you try to access them before initialization. **Typed property foo::$bar must not be accessed before initialization** <?php class User { public $id; public string $name; // Typed property (Uninitialized) public ?string $age = null; // Typed property (Initialized) } $user = new User; var_dump(is_null($user->id)); // bool(true) var_dump(is_null($user->name)); // PHP Fatal error: Typed property User::$name must not be accessed before initialization var_dump(is_null($user->age));// bool(true) ?> Another thing worth noting is that it's not possible to initialize a property of type object to anything other than null. Since the evaluation of properties happens at compile-time and object instantiation happens at runtime. One last thing, callable type is not supported due to its context-dependent behavior. ---- Server IP: 45.112.84.4 Probable Submitter: 185.85.3.172 (proxied: 151.255.133.105) ---- Manual Page -- http://php.net/manual/en/migration74.new-features.php Edit -- https://master.php.net/note/edit/124654 Del: integrated -- https://master.php.net/note/delete/124654/integrated Del: useless -- https://master.php.net/note/delete/124654/useless Del: bad code -- https://master.php.net/note/delete/124654/bad+code Del: spam -- https://master.php.net/note/delete/124654/spam Del: non-english -- https://master.php.net/note/delete/124654/non-english Del: in docs -- https://master.php.net/note/delete/124654/in+docs Del: other reasons-- https://master.php.net/note/delete/124654 Reject -- https://master.php.net/note/reject/124654 Search -- https://master.php.net/manage/user-notes.php