PHP在多维数组指定位置插入单元

protected function _getSellerMenuList() {
$menu_list = array(
  "goods" => array("name" => "商品", "child" => array(
    array("name" => "商品发布", "act"=>"goods_add", "op"=>"index"),
    array("name" => "淘宝导入", "act"=>"import", "op"=>"index"),
    array("name" => "出售中的商品", "act"=>"online", "op"=>"index"),
    array("name" => "仓库中的商品", "act"=>"offline", "op"=>"index"),
    array("name" => "关联版式", "act"=>"store_plate", "op"=>"index"),
    array("name" => "商品规格", "act" => "spec", "op" => "index"),
    array("name" => "图片空间", "act"=>"album", "op"=>"album_cate"),
 )),
 "promotion" => array("name" => "促销", "child" => array(
    array("name" => "抢购管理", "act"=>"groupbuy", "op"=>"index"),
    array("name" => "代金券管理", "act"=>"voucher", "op"=>"list"),
    array("name" => "活动管理", "act"=>"activity", "op"=>"activity"),
    array("name" => "申请授权", "act" =>"accredit", "op"=>"list"),
    array("name" => "会员管理", "act"=>"membercard", "op"=>"list")
 ))
);
if (!checkPlatformStore()) {
  $points = array("name" => "积分管理","act"=>"points","op"=>"index");
  /*array_splice(array,start,lenght,array) 第四个参数使用数组的话
   用array再包一下，否则当字符串来识别，多维数组伤不起啊……/(ㄒoㄒ)/~~ */
  array_splice($menu_list["promotion"]["child"],2,0,array($points));
}
  return $menu_list;
}