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<?php class C { private $_arr = []; public $arr { &get => $this->_arr; } } $c = new C(); $c->arr['beep'] = 'boop'; var_dump($c);
Output for rfc.property-hooks
object(C)#1 (1) { ["_arr":"C":private]=> array(1) { ["beep"]=> string(4) "boop" } }

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