Question

我有多维数组的这种组合，但是我无法在屏幕上输出正确的值，

$parent = array(
    array(
        'function_name' => 'home',
        'screen_name' => 'Home'
        ),

    array(
        'function_name' => 'categories',
        'screen_name' => 'Categories',


        array(
            'function_name' => 'post',
            'screen_name' => 'Post',
            )
        ),

    array(
        'function_name' => 'pages',
        'screen_name' => 'Pages',


        array(
            'function_name' => 'add',
            'screen_name' => 'Add',

            array(
                'function_name' => 'manage',
                'screen_name' => 'Manage'
                )
            )
        )
);

有些数组本身，有些是 sub 数组，有些子数组有 subsub 数组。

foreach($parent as $index => $item)
{   
    echo 'parent - '.$item['screen_name'].'<br/>';

    foreach($item as $child)
    {
        echo 'child - '.$child['screen_name'].'<br/>';

        foreach($child as $grandchild)
        {
            echo 'grandchild - '.$grandchild['screen_name'].'<br/>';
        }
    }
}

错误消息，

Warning: Invalid argument supplied for foreach() in -> foreach($child as $grandchild)

我要找的结果是这样的，

parent - Home
parent - Categories
  child - Post
parent - Pages
  child - Add
     grandchild - Manage

修改

我尝试过以下测试，

foreach ($system as $inner_1) {

    if (is_array($inner_1)) 
    {

        foreach ($inner_1 as $inner_2) 
        {

             if (is_array($inner_2)) 
             {
                  foreach ($inner_2 as $inner_3) 
                  {
                     var_dump($inner_3['function_name']);
                  }
             }
        }
    }
}

但是我得到了一个奇怪的结果，

string 'p' (length=1) // don't know why I get this.
string 'P' (length=1) // don't know why I get this.

string 'a' (length=1) // don't know why I get this.
string 'A' (length=1) // don't know why I get this.

string 'manage' (length=6) // correct result.

Answer 1

在foreach($item as $child)上运行$parent[1]时，$child会采用以下值：'home'，'Home'和数组。

如何保持数组纯粹是关联的？

$parent = array(
    array(
        'function_name' => 'categories',
        'screen_name' => 'Categories',
        'children' => array(
            array(
                'function_name' => 'post',
                'screen_name' => 'Post'
            ),
            array(
                'function_name' => 'review',
                'screen_name' => 'Review',
                'children' => array(
                    ...
                )
            ),
        )
    )
);

这样你可以运行foreach ($item['children'] as $child)知道参数是一个数组（你需要确保$item['children']存在并且是一个数组）。

打印一维，二维和三维数组的组合值

1 个答案: