Få ændret Preorder Tree Traversal Data i en Array

Giv denne kode et skud. $results er databaseresultaterne. $tree er det array, du får tilbage.

function create_tree ($results) {

    $return = $results[0];
    array_shift($results);

    if ($return['lft'] + 1 == $return['rgt'])
        $return['leaf'] = true;
    else {
        foreach ($results as $key => $result) {
            if ($result['lft'] > $return['rgt']) //not a child
                break;
            if ($rgt > $result['lft']) //not a top-level child
                continue;
            $return['children'][] = create_tree(array_values($results));
            foreach ($results as $child_key => $child) {
                if ($child['rgt'] < $result['rgt'])
                    unset($results[$child_key]);
            }
            $rgt = $result['rgt'];
            unset($results[$key]);
        }
    }

    unset($return['lft'],$return['rgt']);
    return $return;

}
$tree = create_tree($results);