May be used to print nested category structure with parent_id, category_id attributes

nested tree structure

function build_nested_array($records){
    /* Build nested array on the menu example */
    $menu = array();
    $menu_index = array();
    foreach ($records as $record){
        if($record['parent_id'] == 0) {
            $menu[] = [
                'name' => $record->name,
                'child' => []
            ];
            $menu_index[$record->id] = &$menu[sizeof($menu)-1];
        } else {
            $menu_index[$record->parent_id]['child'][] = [
                'name' => $record->name
            ];
            $menu_index[$record->id] = &$menu_index[$record->parent_id]['child'][sizeof($menu_index[$record->parent_id]['child'])-1];
        }
    }
    return $menu;
}