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请教一个php多维数组排序问题
- WBOYオリジナル
- 2016-06-06 20:15:20936ブラウズ
php新手请教一个问题；
原数组结构如下，原数组是按ads_id，time进行排序；
现在的需求是根据二维数组的num总和重新进行排序
<code>Array
(
[5] => Array
(
[0] => Array
(
[num] => 840
[time] => 2015-10
[ads_id] => 5
)
[1] => Array
(
[num] => 684
[time] => 2015-11
[ads_id] => 5
)
)
[6] => Array
(
[0] => Array
(
[num] => 23
[time] => 2015-10
[ads_id] => 6
)
[1] => Array
(
[num] => 37
[time] => 2015-11
[ads_id] => 6
)
)
[7] => Array
(
[0] => Array
(
[num] => 280
[time] => 2015-10
[ads_id] => 7
)
[1] => Array
(
[num] => 343
[time] => 2015-11
[ads_id] => 7
)
)
)
</code>
最终实现排序如下：
<code>Array
(
[5] => Array
(
[0] => Array
(
[num] => 840
[time] => 2015-10
[ads_id] => 5
)
[1] => Array
(
[num] => 684
[time] => 2015-11
[ads_id] => 5
)
)
[7] => Array
(
[0] => Array
(
[num] => 280
[time] => 2015-10
[ads_id] => 7
)
[1] => Array
(
[num] => 343
[time] => 2015-11
[ads_id] => 7
)
)
[6] => Array
(
[0] => Array
(
[num] => 23
[time] => 2015-10
[ads_id] => 6
)
[1] => Array
(
[num] => 37
[time] => 2015-11
[ads_id] => 6
)
)
)
</code>
回复内容：
php新手请教一个问题；
原数组结构如下，原数组是按ads_id，time进行排序；
现在的需求是根据二维数组的num总和重新进行排序
<code>Array
(
[5] => Array
(
[0] => Array
(
[num] => 840
[time] => 2015-10
[ads_id] => 5
)
[1] => Array
(
[num] => 684
[time] => 2015-11
[ads_id] => 5
)
)
[6] => Array
(
[0] => Array
(
[num] => 23
[time] => 2015-10
[ads_id] => 6
)
[1] => Array
(
[num] => 37
[time] => 2015-11
[ads_id] => 6
)
)
[7] => Array
(
[0] => Array
(
[num] => 280
[time] => 2015-10
[ads_id] => 7
)
[1] => Array
(
[num] => 343
[time] => 2015-11
[ads_id] => 7
)
)
)
</code>
最终实现排序如下：
<code>Array
(
[5] => Array
(
[0] => Array
(
[num] => 840
[time] => 2015-10
[ads_id] => 5
)
[1] => Array
(
[num] => 684
[time] => 2015-11
[ads_id] => 5
)
)
[7] => Array
(
[0] => Array
(
[num] => 280
[time] => 2015-10
[ads_id] => 7
)
[1] => Array
(
[num] => 343
[time] => 2015-11
[ads_id] => 7
)
)
[6] => Array
(
[0] => Array
(
[num] => 23
[time] => 2015-10
[ads_id] => 6
)
[1] => Array
(
[num] => 37
[time] => 2015-11
[ads_id] => 6
)
)
)
</code>
<code>function mySort($a, $b) {
$sumA = 0;
$sumB = 0;
foreach($a as $ele) {
$sumA += $ele['num'];
}
foreach($b as $ele) {
$sumB += $ele['num'];
}
return $sumB </code>
使用 usort 自定义排序规则
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