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<?php class Foo { public ?Foo $foo; } $x = new Foo(); var_dump($x->foo);
Output for 7.4.4 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Fatal error: Uncaught Error: Typed property Foo::$foo must not be accessed before initialization in /in/6TRAY:11 Stack trace: #0 {main} thrown in /in/6TRAY on line 11
Process exited with code 255.
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Parse error: syntax error, unexpected '?', expecting function (T_FUNCTION) or const (T_CONST) in /in/6TRAY on line 5
Process exited with code 255.
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