如何访问CodeIgniter中数组中的数组？ 我是CI的新手。我有一个函数可以访问数据列表作为类别。功能就是这样： 公共功能get_category_tree（） { $ this-> ci-> db->其中（'is_display'，'1'）; ...

Question

在通用库中定义了此功能，我从控制器访问了它：

$this->data['category_tree'] = $this->general->get_category_tree(); 用来给我这个结果：

    Array
  (
[id] => 19
[parent_id] => 0
[name] => DVDs & Movies
[subcat] => 
    )
    Array
    (
[id] => 32
[parent_id] => 0
[name] => Stamps
[subcat] => Array
    (
        [0] => Array
            (
                [id] => 78
                [parent_id] => 32
                [name] => Africa
            )

        [1] => Array
            (
                [id] => 79
                [parent_id] => 32
                [name] => Asia
            )

        [2] => Array
            (
                [id] => 80
                [parent_id] => 32
                [name] => Australia
            )

        [3] => Array
            (
                [id] => 81
                [parent_id] => 32
                [name] => Br Comm Other
            )

        [4] => Array
            (
                [id] => 82
                [parent_id] => 32
                [name] => Canada
            )

        [5] => Array
            (
                [id] => 83
                [parent_id] => 32
                [name] => Europe
            )

        [6] => Array
            (
                [id] => 84
                [parent_id] => 32
                [name] => Latin America
            )

        [7] => Array
            (
                [id] => 85
                [parent_id] => 32
                [name] => Middle East
            )

        [8] => Array
            (
                [id] => 86
                [parent_id] => 32
                [name] => Publications
            )

        [9] => Array
            (
                [id] => 87
                [parent_id] => 32
                [name] => Topical & Specialty
            )

        [10] => Array
            (
                [id] => 88
                [parent_id] => 32
                [name] => UK (Great Britain)
            )

        [11] => Array
            (
                [id] => 89
                [parent_id] => 32
                [name] => United States
            )

        [12] => Array
            (
                [id] => 90
                [parent_id] => 32
                [name] => Worldwide
            )

    )

   )

现在我将php升级到7+，现在这条线

$categories_arr[$cat->parent_id]['subcat'][] = array('id' => $cat->id, 'parent_id' => $cat->parent_id, 'name' => $cat->name);

diD不起作用并给出了PHP错误，我只是删除了[]，然后变成了

$categories_arr[$cat->parent_id]['subcat'] = array('id' => $cat->id, 'parent_id' => $cat->parent_id, 'name' => $cat->name);

现在我print_it时会给我这个结果：

    Array
   (
  [id] => 19
  [parent_id] => 0
  [name] => DVDs & Movies
  [subcat] => 
   )
   Array
  (
  [id] => 32
  [parent_id] => 0
 [name] => Stamps
[subcat] => Array
    (
        [id] => 90
        [parent_id] => 32
        [name] => Worldwide
    )

  )

the仅是子数组的最后一个数组。我该如何解决。我搜索了很多有关升级和修复的信息，但无法打磨任何有用的东西。任何人都可以帮忙吗？预先感谢

b，因为在定义

subcat

中将

'subcat' => ''

定义为字符串。使用此：

Answer 1

$categories_arr[$cat->id]