我试图使用foreach循环在PHP中创建一个多维数组.这是迄今为止的代码:
$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>';
此代码的输出是单维数组;然而,这不是意图.所需的数组应如下所示:
解决方法:
你到处都是.只需将该级别添加到数组创建中:)
$levels = array('low', 'medium', 'high');
$attributes = array('fat', 'quantity', 'ratio', 'label');
foreach ($levels as $key => $level):
foreach ($attributes as $k =>$attribute):
$variables[$level][] = $attribute . '_' . $level; // changed $variables[] to $variables[$level][]
endforeach;
endforeach;
echo '<pre>' . print_r($levels,1) . '</pre>';
echo '<pre>' . print_r($variables,1) . '</pre>';
产量
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
)
)
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。