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<?php readonly class Foo { public function __construct( public int $id, public string $name, ) { } } $foo = new Foo(1, 'foo'); $foo->id = 2; var_dump($foo);
Output for git.master_jit, git.master
Fatal error: Uncaught Error: Cannot modify readonly property Foo::$id in /in/REik5:13 Stack trace: #0 {main} thrown in /in/REik5 on line 13
Process exited with code 255.

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