static function attachChildren(&$array)
{
$count = count($array);
for ($i = 1; $i < $count; $i++) {
$found = false;
$array[$i - 1] = Arrays::replaceAllParents('!children', $array[$i], $array[$i - 1], 1, $found);
if ($found) {
//collapse tree
array_splice($array, $i - 1, 2, [$array[$i - 1]]);
}
}
return $array;
}