如何按索引值重新排序数组？ [重复]

Question

这个问题在这里已有答案：

• How can I sort arrays and data in PHP? 9个答案

我试图按索引值对数组进行排序，请看一下给定的数组：

Array
(
    [0] => stdClass Object
        (
            [id] => 645
            [fullname] => sumeena
            [quoteemail] => [email protected]
            [budget] => $2000+
            [user_id] => 681
            [p_notif_by] => 1,36,31,41,39,38,37,32
            [created_on] => 2015-10-07 06:55:05
            [CREATED_ON] => 2015-10-07 06:54:35
        )

    [1] => stdClass Object
        (
            [id] => 641
            [fullname] => sumeena
            [quoteemail] => [email protected]
            [budget] => $2000+
            [user_id] => 677
            [p_notif_by] => 1,36,31,41,39,38,37,32
            [created_on] => 2015-10-07 03:14:41
            [CREATED_ON] => 2015-10-07 03:13:13
        )

    [2] => stdClass Object
        (
            [id] => 640
            [fullname] => Test Do Not Delete
            [quoteemail] => [email protected]
            [budget] => $1,500-$2,000
            [user_id] => 676
            [p_notif_by] => 1,39,36,31,41,38,37,32
            [created_on] => 2015-10-07 02:43:16
            [CREATED_ON] => 2015-10-07 02:43:16
        )

    [3] => stdClass Object
        (
            [id] => 19
            [fullname] => Chris Tou Is Testing
            [quoteemail] => [email protected]
            [budget] => More than $2,000
            [user_id] => 47
            [p_notif_by] => 32,36,38,1,31,34,41,37,42,35,45,39,40,44,92,252,596,640,648,646
            [created_on] => 2015-09-07 23:49:35
            [CREATED_ON] => 2015-09-08 12:29:03
        )

)

那么，这是数组，现在我想通过索引'CREATED_ON'对这个数组进行排序，怎么可能呢？

Answer 1

你可以简单地像使用usort一样

usort($your_array, function($a, $b) {
    return strtotime($a->CREATED_ON) - strtotime($b->CREATED_ON);
});

Answer 2

尝试使用：

usort($myArray, function($a, $b) {
    return strtotime($a->CREATED_ON) - strtotime($b->CREATED_ON);
});