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<?php class Item { public static function &newWithParent(Item $parent) { $item = new Item(); $item->parent = $parent; return $item; } private $parent; public function &getParent() { return $this->parent; } } $item = Item::newWithParent(Item::newWithParent(Item::newWithParent(new Item()))); // Basically it's this now: {"parent":{"parent":{"parent":{"parent":null}}}} // I want to set that null value var_dump($item); do { $item = $item->getParent(); if ($item->getParent() === null) { $item = Item::newWithParent($item); break; } } while (true); var_dump($item);

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