按给定索引对多维数组进行排序 - PHP？

我有两个数组$days_order and $mysql_result,我要排序$mysql_result数组使用$days_order大批。我想以天数升序显示 MySQL 结果？有什么办法可以做到这一点或任何其他方式，以便我可以通过$days_order在 MySQL 查询中OrderBy部分？

$days_order =  Array([0] => 2[1] => 3[2] => 4[3] => 5 [4] => 6[5] => 7[6] => 1);

$mysql_result = Array (

    [0] => Array
        (
            [hashtag] => a7e87329b5eab8578f4f1098a152d6f4
            [title] => Flower
            [day] => 3
        )

[1] => Array
    (
        [hashtag] => b24ce0cd392a5b0b8dedc66c25213594
        [title] => Free
        [day] => 2
    )

[2] => Array
    (
        [hashtag] => e7d31fc0602fb2ede144d18cdffd816b
        [title] => Ready
        [day] => 1
    )
)

我想要排序数组$days_order

Output:

  Array
(
  [0] => Array
    (
           [hashtag] => b24ce0cd392a5b0b8dedc66c25213594
           [title] => Free
           [day] => 2
    )
  [1] => Array
        (
            [hashtag] => a7e87329b5eab8578f4f1098a152d6f4
            [title] => Flower
            [day] => 3
        )

  [2] => Array
    (
           [hashtag] => e7d31fc0602fb2ede144d18cdffd816b
           [title] => Ready
           [day] => 1
    )    
)

Use usort具有自定义比较功能。

就像是：

usort($ranked, function($a, $b) {
    if ($a['day'] === $b['day']) return 0;

    return ($a['day'] > $b['day']) ? -1 : 1;
});

您可以阅读有关此功能的更多信息here.