thinkphp按照父级栏目id数组进行排序输出显示

topid：顶级栏目字段

id：栏目数据表的栏目id

whereIn：用此进行数组条件查询

orderRaw：特殊排序条件

// 栏目首页 列表
	public function index()
	{

		// 顶级栏目排序
		$topid = db('arctype')->where('topid',0)->field('id')->order('id asc')->select();
		// 定义空数组
		$typeid = array();
		foreach ($topid as $key => $value) {
			$munuid = db('arctype')->where('topid',$value['id'])->field('id')->order('id asc')->select();
			$typeid[].= $value['id'];
			foreach ($munuid as $key => $value2) {
				$typeid[].= $value2['id'];
			}
		}

		$result = db('channeltype')
		->alias('a')
		->join('arctype c','a.id = c.current_channel')
		->where('c.is_del',0)
		->whereIn('c.id',$typeid)
		->orderRaw("FIELD(c.id, " . implode(',', $typeid) . ")")
		->select();

		$this->assign('result',$result);
		return $this->fetch('lanmu/list');
	}