根据php中的日期时间对数组进行排序
问题描述：
Array
(
[0] => Array
(
[dateTime] => 2011-10-18 0:0:00
[chanl1] => 20.7
[chanl2] => 45.4
[chanl3] =>
)
[1] => Array
(
[dateTime] => 2011-10-18 0:15:00
[chanl1] => 20.7
[chanl2] => 45.4
[chanl3] =>
)
[2] => Array
(
[dateTime] => 2011-10-18 00:14:00
[chanl1] => 20.7
[chanl2] => 33.8
[chanl3] =>
)
[3] => Array
(
[dateTime] => 2011-10-18 00:29:00
[chanl1] => 20.6
[chanl2] => 33.9
[chanl3] =>
)
我想根据[dateTime]对上面的数组进行排序，最终输出应该是:
I want to sort the above array based on the [dateTime], the final output should be:
Array
(
[0] => Array
(
[dateTime] => 2011-10-18 0:0:00
[chanl1] => 20.7
[chanl2] => 45.4
[chanl3] =>
)
[1] => Array
(
[dateTime] => 2011-10-18 00:14:00
[chanl1] => 20.7
[chanl2] => 33.8
[chanl3] =>
)
[2] => Array
(
[dateTime] => 2011-10-18 0:15:00
[chanl1] => 20.7
[chanl2] => 45.4
[chanl3] =>
)
[3] => Array
(
[dateTime] => 2011-10-18 00:29:00
[chanl1] => 20.6
[chanl2] => 33.9
[chanl3] =>
)
有人知道怎么做吗?谢谢！
Is there anyone know how to do it? Thanks!
答
Use usort() function with custom comparator:
$arr = array(...);
usort($arr, function($a, $b) {
$ad = new DateTime($a['dateTime']);
$bd = new DateTime($b['dateTime']);
if ($ad == $bd) {
return 0;
}
return $ad < $bd ? -1 : 1;
});
DateTime 类具有重载的比较运算符(<, >, ==).
DateTime class has overloaded comparison operators (<, >, ==).