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<?php class Foo { readonly int $foo; public function __set($key, $value) { echo "__set called with {$value}\n"; } } $f = new Foo; $f->foo = 43;
Output for 8.1.13
Fatal error: Uncaught Error: Cannot initialize readonly property Foo::$foo from global scope in /in/ld621:12 Stack trace: #0 {main} thrown in /in/ld621 on line 12
Process exited with code 255.

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