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<?php $object = new \ArrayObject(['item' => null]); var_dump($object instanceof \ArrayAccess, isset($object['item'])); $object->item;
based on eqj4G
Output for 5.6.30, hhvm-3.18.5 - 3.21.3, 7.1.0 - 7.2.11
bool(true) bool(false) Notice: Undefined property: ArrayObject::$item in /in/qtss2 on line 5
Output for hhvm-3.22.0
bool(true) bool(false) Notice: Undefined property: ArrayObject::$item in /in/qtss2 on line -1