function getTree($data) { $items = []; foreach ($data as $v){ $items[$v['id']] = $v; // $items[1] = } $tree = array(); //格式化好的树 foreach ($items as $item) if (isset($items[$item['pid']])) $items[$item['pid']]['son'][] = &$items[$item['id']]; else $tree[] = &$items[$item['id']]; return $tree; }