使用foreach循环创建多维数组 [英] create multidimensional array using a foreach loop

问题描述

我正在尝试使用foreach循环在PHP中创建多维数组.这是到目前为止的代码:

I am trying to create a multidimensional array in PHP using a foreach loop. Here is the code thus far:

$levels = array('low', 'medium', 'high');
$attributes = array('fat', 'quantity', 'ratio', 'label');

foreach ($levels as $key => $level):
       foreach ($attributes as $k =>$attribute):
             $variables[] = $attribute . '_' . $level;
       endforeach;
endforeach;

echo '<pre>' . print_r($levels,1) . '</pre>';   
echo '<pre>' . print_r($variables,1) . '</pre>';    

此代码的输出是一维数组；但是，这不是目的.所需的数组应如下所示:

The output from this code is a single dimension array; however, that is not the intent. The desired array should look like this:

如何修改代码以实现目标?

How should the code be modified to achieve the goal?

推荐答案

您几乎在那儿.只需将级别添加到数组创建中即可:)

You're aaalmost there. Just add the level to the array creation :)

$levels = array('low', 'medium', 'high');
$attributes = array('fat', 'quantity', 'ratio', 'label');

foreach ($levels as $key => $level):
       foreach ($attributes as $k =>$attribute):
             $variables[$level][] = $attribute . '_' . $level; // changed $variables[] to $variables[$level][]
       endforeach;
endforeach;

echo '<pre>' . print_r($levels,1) . '</pre>';   
echo '<pre>' . print_r($variables,1) . '</pre>';  

输出

Array
(
    [low] => Array
        (
            [0] => fat_low
            [1] => quantity_low
            [2] => ratio_low
            [3] => label_low
        )

    [medium] => Array
        (
            [0] => fat_medium
            [1] => quantity_medium
            [2] => ratio_medium
            [3] => label_medium
        )

    [high] => Array
        (
            [0] => fat_high
            [1] => quantity_high
            [2] => ratio_high
            [3] => label_high
        )

)

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