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<?php class Item { public $name; public $parent; public function __construct($name, $parent = null) { $this->name = $name; $this->parent = $parent; } } function render(Item $item) { yield $item; if (is_object($item) && $item->parent) { yield from render($item->parent); } } $a = new Item('a'); $b = new Item('b', $a); $c = new Item('c', $b); $d = new Item('d', $c); $e = new Item('e', $d); foreach (render($e) as $item) { var_dump($item); }
Output for git.master, git.master_jit, rfc.property-hooks
object(Item)#5 (2) { ["name"]=> string(1) "e" ["parent"]=> object(Item)#4 (2) { ["name"]=> string(1) "d" ["parent"]=> object(Item)#3 (2) { ["name"]=> string(1) "c" ["parent"]=> object(Item)#2 (2) { ["name"]=> string(1) "b" ["parent"]=> object(Item)#1 (2) { ["name"]=> string(1) "a" ["parent"]=> NULL } } } } } object(Item)#4 (2) { ["name"]=> string(1) "d" ["parent"]=> object(Item)#3 (2) { ["name"]=> string(1) "c" ["parent"]=> object(Item)#2 (2) { ["name"]=> string(1) "b" ["parent"]=> object(Item)#1 (2) { ["name"]=> string(1) "a" ["parent"]=> NULL } } } } object(Item)#3 (2) { ["name"]=> string(1) "c" ["parent"]=> object(Item)#2 (2) { ["name"]=> string(1) "b" ["parent"]=> object(Item)#1 (2) { ["name"]=> string(1) "a" ["parent"]=> NULL } } } object(Item)#2 (2) { ["name"]=> string(1) "b" ["parent"]=> object(Item)#1 (2) { ["name"]=> string(1) "a" ["parent"]=> NULL } } object(Item)#1 (2) { ["name"]=> string(1) "a" ["parent"]=> NULL }

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