?????? ???? ????? ??? ?? ??

?? ?????? ???? ??? ? ???? ??? ?? ??? ??? ??? ????? , ?? ??? ??? ? ????. ? ??? ?? ??? ??? ??-?? ??? ?? ?? ??? ?????.

??:

function buildTree(array $elements, $parentId = 0) {
    $branch = array();

    foreach ($elements as $element) {
        if ($element['parent_id'] == $parentId) {
            $children = buildTree($elements, $element['id']);
            if ($children) {
                $element['children'] = $children;
            }
            $branch[] = $element;
        }
    }

    return $branch;
}

?? ?? :

1. ? ??? ?? ??? ??? ?? ID? ?????. ???? 0???.
2. ??? ? ??? ?????.
3. ??? ?? ID? ??? ?? ID? ???? ?? ??? ??? ?????.
4. ??? ?? ?? ??? ?? ?? ??? ?? ?? ??? ????? ?????.
5. ??? ?? ??? ??? ??? ?????. ?? ??? '??' ? ??? ????.
6. ????? ? ??? ??? ?? ??? ?? ?? ??? ??? ?????.

?? ?:

?? ???? ?? ?????? ??? ??? ??? ????? ??:

$tree = buildTree($rows);

??? $rows? ?????? ??? ?? ?????.

??:

?? ??? ??? ??? ?? ?????. ??:

Array
(
    [0] => Array
        (
            [id] => 1
            [parent_id] => 0
            [title] => Parent Page
            [children] => Array
                        (
                            [0] => Array
                                (
                                    [id] => 2
                                    [parent_id] => 1
                                    [title] => Sub Page
                                    [children] => Array
                                                (
                                                    [0] => Array
                                                        (
                                                            [id] => 3
                                                            [parent_id] => 1
                                                            [title] => Sub Sub Page
                                                        )
                                                )
                                )
                        )
            [children] => Array
                        (
                            [0] => Array
                                (
                                    [id] => 4
                                    [parent_id] => 0
                                    [title] => Another Parent Page
                                    [children] => Array
                                                (

                                                )
                                )
                        )
        )
)

? ??? ?? ?????? ???? ??? ??? ????? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!