private function generateItem(array $item, $level, $num)
{
$title = 1 === $level ? "Parent {$num}" : "Level {$level} child {$num}";
$result = ['title' => $title, 'url' => TextHelper::urlFormat($title)];
if (0 !== count($item)) {
$children = [];
$cnt = 0;
foreach ($item as $child) {
$children[] = $this->generateItem($child, $level + 1, ++$cnt);
}
$result['children'] = $children;
}
return $result;
}
