/**
* Finds a particular TreeNode
*
* @param int $id the id to find
* @param array $list the list of elements to search
* @return Treenode upon success; null on failure
*/
public static function find($id, array &$list)
{
foreach ($list as $item) {
if ($item->id == $id) {
return $item;
}
if ($item->hasChildren()) {
if ($current = TreeNode::find($id, $item->children)) {
return $current;
}
}
}
return null;
}
