[Proposal] Nested tree Flat to hierarchical array about baum HOT 3 CLOSED

<?php
namespace Baum;

use Illuminate\Database\Eloquent\Collection as Eloquent_Collection;

class Collection extends Eloquent_Collection {

    private function nestedArray(&$result, $right = 'rgh', $left = 'lft', $path = '', $level = -1) {
        $new = array();
        if(is_array($result)) {
            while(list($n, $sub) = each($result)) {
                $subId = $sub['id'];
                $new[$subId] = $sub;
                $alias = (isset($sub['data']))?$sub['data']['alias']:'';
                $new[$subId]['_tree_path'] = $path.'/'.$alias;
                $new[$subId]['_tree_level'] = $level + 1;

                if($sub[$right] - $sub[$left] != 1) {
                    // recurse ($result is manipulated by reference!)
                    $new[$subId]['children'] = $this->nestedArray($result, $right, $left, $new[$subId]['_tree_path'], $new[$subId]['_tree_level']);
                }

                $next_id = key($result);
                if($next_id && $result[$next_id]['parent_id'] != $sub['parent_id']) {
                    return $new;
                }
            }
        }
        return $new;
    }

    public function toHierarchical(){
        $tree = $this->toArray();
        return $this->nestedArray($tree);
    }
}

    public function newCollection(array $models = array())
    {
        return new Baum\Collection($models);
    }

<?php
namespace Baum;

use Illuminate\Database\Eloquent\Collection as Eloquent_Collection;

class Collection extends Eloquent_Collection {

    public function toHierarchical(){
        $tree = $this->items;
        return new Eloquent_Collection($this->hierarchical($tree));
    }


    private function hierarchical(&$result) {
        $new = array();
        if(is_array($result)) {
            while(list($n, $sub) = each($result)) {
                $new[$sub->getKey()] = $sub;
                if($sub->getRight() - $sub->getLeft() != 1) {
                    $new[$sub->getKey()]->children = $this->hierarchical($result);
                }
                $next_id = key($result);
                if($next_id && $result[$next_id]->getParentId() != $sub->getParentId()) {
                    return $new;
                }
            }
        }
        return $new;
    }
}