我试图通过多个键对多维数组进行排序,我不知道从哪里开始.我看着uasort,但不太确定如何为我需要的东西编写函数.
我需要按州,然后是event_type,然后按日期排序.
我的数组看起来像这样:
Array
(
[0] => Array
(
[ID] => 1
[title] => Boring Meeting
[date_start] => 2010-07-30
[time_start] => 06:45:PM
[time_end] =>
[state] => new-york
[event_type] => meeting
)
[1] => Array
(
[ID] => 2
[title] => Find My Stapler
[date_start] => 2010-07-22
[time_start] => 10:45:AM
[time_end] =>
[state] => new-york
[event_type] => meeting
)
[2] => Array
(
[ID] => 3
[title] => Mario Party
[date_start] => 2010-07-22
[time_start] => 02:30:PM
[time_end] => 07:15:PM
[state] => …我有以下数组:
$arr = [
[
'user_id' => 1,
'product_id' => 1
],
[
'user_id' => 1,
'product_id' => 2
],
[
'user_id' => 1,
'product_id' => 3
],
[
'user_id' => 2,
'product_id' => 1
],
[
'user_id' => 2,
'product_id' => 2
],
[
'user_id' => 3,
'product_id' => 1
]
];
我想对它进行排序,看起来像这样:
$arr = [
[
'user_id' => 1,
'product_id' => 1
],
[
'user_id' => 2,
'product_id' => 1
],
[
'user_id' => 3,
'product_id' => 1 …我有一个数组，每个数组有4个值
$array[0] = array('amount' => '98.60', 'typeA' => '98.52', 'typeB' => '58.52', 'typeC' => '90.2');
$array[1] = array('amount' => '55.80', 'typeA' => '25.36', 'typeB' => '36.54', 'typeC' => '36.99');
$array[2] = array('amount' => '42.68', 'typeA' => '64.26', 'typeB' => '65.87', 'typeC' => '99.24');
$array[3] = array('amount' => '812.3', 'typeA' => '36.27', 'typeB' => '23.25', 'typeC' => '94.35');
我需要根据每个键的最高值按以下顺序排列数组：
所以最后我将看到哪个是最高金额。
希望这里能有所帮助，谢谢！
我有一个多维数组，看起来像：
$arr=Array
(
[0] => Array
(
[0] => TEAM1
[1] => 3
[2] => 0
[3] => 422.47
[4] => 192.62
)
[1] => Array
(
[0] => TEAM2
[1] => 2
[2] => 1
[3] => 402.14
[4] => 210.70
)
[2] => Array
(
[0] => TEAM3
[1] => 3
[2] => 0
[3] => 376.79
[4] => 174.64
)
)
这5栏与团队名称，＃胜利，＃损失，＃的得分，＃的得分有关。
我将如何$arr按第1列（获胜次数）（降序），第2列（损失数）（升序），然后第3列（要获得的点数）（降序）进行排序
usort($childs, function($a, $b) {
return $a['parent_id'] - $b['parent_id'];
});
在这里,我用1个字段对它进行排序,如何添加更多字段来对它们进行排序？,就好像它是ORDER BY field1, field2, field3在Mysql中一样