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<?php readonly class A implements IteratorAggregate { function __construct(public string $foo = 'bar') {} function getIterator() : Traversable { return new ArrayIterator($this); } } $obj = new A; foreach ($obj as $k => &$v) { $v = 'baz'; } var_dump($obj); // changed a readonly property
Output for git.master_jit, git.master
object(A)#1 (1) { ["foo"]=> &string(3) "baz" }

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