Array
(
[1] => Array
(
[id] => 1
[access_id] => 1
[name] => 统计报表
[module] => manage
[parent_id] => 0
[icon] => fa-dashboard
[type] => menu
[sort] => 0
[status] => 1
[access_name] => 统计报表
[controller] => dashboard
[action] => index
)
[2] => Array
(
[id] => 2
[access_id] =>
[name] => 个人中心
[module] => manage
[parent_id] => 0
[icon] => fa-male
[type] => menu
[sort] => 1
[status] => 1
[access_name] =>
[controller] =>
[action] =>
[_child] => Array
(
[3] => Array
(
[id] => 3
[access_id] =>
[name] => 修改个人信息
[module] => manage
[parent_id] => 2
[icon] =>
[type] => menu
[sort] => 0
[status] => 1
[access_name] =>
[controller] =>
[action] =>
)
)
)
[4] => Array
(
[id] => 4
[access_id] =>
[name] => 广告管理
[module] => manage
[parent_id] => 0
[icon] => fa-th
[type] => menu
[sort] => 2
[status] => 1
[access_name] =>
[controller] =>
[action] =>
[_child] => Array
(
[5] => Array
(
[id] => 5
[access_id] =>
[name] => 广告位管理
[module] => manage
[parent_id] => 4
[icon] =>
[type] => menu
[sort] => 0
[status] => 1
[access_name] =>
[controller] =>
[action] =>
[_child] => Array
(
[8] => Array
(
[id] => 8
[access_id] =>
[name] => 添加广告位
[module] => manage
[parent_id] => 5
[icon] =>
[type] => menu
[sort] => 1
[status] => 1
[access_name] =>
[controller] =>
[action] =>
)
[7] => Array
(
[id] => 7
[access_id] =>
[name] => 广告位列表
[module] => manage
[parent_id] => 5
[icon] =>
[type] => menu
[sort] => 2
[status] => 1
[access_name] =>
[controller] =>
[action] =>
)
)
)
[6] => Array
(
[id] => 6
[access_id] =>
[name] => 广告内容管理
[module] => manage
[parent_id] => 4
[icon] =>
[type] => menu
[sort] => 1
[status] => 1
[access_name] =>
[controller] =>
[action] =>
[_child] => Array
(
[9] => Array
(
[id] => 9
[access_id] =>
[name] => 广告列表
[module] => manage
[parent_id] => 6
[icon] =>
[type] => menu
[sort] => 0
[status] => 1
[access_name] =>
[controller] =>
[action] =>
)
[10] => Array
(
[id] => 10
[access_id] =>
[name] => 添加广告
[module] => manage
[parent_id] => 6
[icon] =>
[type] => menu
[sort] => 1
[status] => 1
[access_name] =>
[controller] =>
[action] =>
)
)
)
)
)
)上面是个数组，包含的是菜单的信息，可能有很多维，现在有一个问题是如果一个菜单的id位8，也就是索引为 $arr[4]['_child'][5]['_child'][8] 这个菜单，我如何通过写一个函数，返回一个数组，该数组包含了所有的索引值，比如id为8的这个菜单，返回 [4,5,8]。
