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<?php class Foo { public function __construct(public public(set) readonly array $x = [1, 2, 3]) { } } $f = new Foo(); $f->x['x'] = 'y'; var_dump($f);
Output for git.master, git.master_jit
Fatal error: Uncaught Error: Cannot indirectly modify readonly property Foo::$x in /in/vS0ij:8 Stack trace: #0 {main} thrown in /in/vS0ij on line 8
Process exited with code 255.

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