問題描述

我正在嘗試使用 foreach 循環(huán)在 PHP 中創(chuàng)建一個多維數(shù)組.這是目前為止的代碼:

$levels = array('low', 'medium', 'high');$attributes = array('fat', 'quantity', 'ratio', 'label');foreach ($levels as $key => $level):foreach ($attributes as $k =>$attribute):$variables[] = $attribute .'_' .$級別;Endforeach;Endforeach;echo '
'.print_r($levels,1) .'</pre>';echo '
'.print_r($variables,1) .'</pre>';
這段代碼的輸出是一個一維數(shù)組；然而，這不是本意.所需的數(shù)組應如下所示:
應該如何修改代碼才能達到目標?
 解決方案 
您就快到了.只需將級別添加到數(shù)組創(chuàng)建中:)
$levels = array('low', 'medium', 'high');$attributes = array('fat', 'quantity', 'ratio', 'label');foreach ($levels as $key => $level):foreach ($attributes as $k =>$attribute):$variables[$level][] = $attribute .'_' .$級別;//將 $variables[] 改為 $variables[$level][]Endforeach;Endforeach;echo '
'.print_r($levels,1) .'</pre>';echo '
'.print_r($variables,1) .'</pre>';
輸出
數(shù)組([低] =>大批([0] =>脂肪_低[1] =>數(shù)量_低[2] =>比率_低[3] =>標簽低)[中] =>大批([0] =>肥中[1] =>數(shù)量_中等[2] =>比率_中[3] =>label_medium)[高] =>大批([0] =>脂肪高[1] =>數(shù)量_高[2] =>比率_高[3] =>標簽高))
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>';    
The output from this code is a single dimension array; however, that is not the intent.  The desired array should look like this:



How should the code be modified to achieve the goal?
 解決方案 
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>';  
Output
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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