javascript - 如何在 javascript/php 中调用具有子级的数组列表

Question

我在如何使用 javascript 列出数组子项时遇到了麻烦。 这是我的 php 代码:

$arr = array();
foreach ($categories as $key => $cat) {
    if($cat['parent_id'] == 0){
    $arr[$cat['id']] = $cat;

    }else{
        $arr[$cat['parent_id']][] = $cat;
    }
}

其输出是:

Array ( 
[1] => Array (
     [id] => 1
      [parent_id] => 0
      [name] => A 
        [0] => Array (
             [id] => 2 
             [parent_id] => 1
              [name] => B 
        ) 
        [1] => Array (
            [id] => 3
            [parent_id] => 1 
            [name] => C 
         ) 
        [2] => Array (
             [id] => 4 
             [parent_id] => 1
             [name] => D
        )
 ) 
 [5] => Array (
         [id] => 5
         [parent_id] => 0
         [name] => E
            [0] => Array (
               [id] => 6
               [parent_id] => 5
               [name] => F
             ) 
             [1] => Array (
                 [id] => 7
                 [parent_id] => 5
                 [name] => G
        )
)

这是我希望使用 javascript 或 php 创建的输出:

Answer 1

尝试:

print_r($cat[1][name]);

结果是什么？