Question

我有这个多维数组，我想按'fecha'命令每个数组（我的意思是2017-02-20，然后是2017-02-21，然后是2017-02-22，最后是2017-02-23）。我已经阅读了很多答案，但它们只适用于二维数组。我尝试过unsort和array_multisort，即使使用ksort bue我也无法获得所需的结果。

Array
    (
        [0.10] => Array
            (
                [0] => Array
                    (
                        [fecha] => 2017-02-21
                        [tarifa] => 743.80
                        [percent] => 0.10
                    )

                [1] => Array
                    (
                        [fecha] => 2017-02-22
                        [tarifa] => 743.80
                        [percent] => 0.10
                    )

                [2] => Array
                    (
                        [fecha] => 2017-02-20
                        [tarifa] => 743.80
                        [percent] => 0
                    )

                [3] => Array
                    (
                        [fecha] => 2017-02-23
                        [tarifa] => 743.80
                        [percent] => 0
                    )

            )

        [0.15] => Array
            (
                [0] => Array
                    (
                        [fecha] => 2017-02-21
                        [tarifa] => 743.80
                        [percent] => 0.15
                    )

                [1] => Array
                    (
                        [fecha] => 2017-02-22
                        [tarifa] => 743.80
                        [percent] => 0.15
                    )

                [2] => Array
                    (
                        [fecha] => 2017-02-20
                        [tarifa] => 743.80
                        [percent] => 0
                    )

                [3] => Array
                    (
                        [fecha] => 2017-02-23
                        [tarifa] => 743.80
                        [percent] => 0
                    )

            )

    )

Answer 1

您可以usort使用strtotime按日期排序。

ASC按日期排序（fecha）：

foreach ($yourArray as $key => $subarray) {
    usort($subarray, function($a, $b) {
            return strtotime($a['fecha']) - strtotime($b['fecha']);
        });
    $yourArray[$key] = $subarray;
 }

print_r($yourArray);

按日期排序DESC（fecha）：

foreach ($yourArray as $key => $subarray) {
    usort($subarray, function($a, $b) {
            return strtotime($b['fecha']) - strtotime($a['fecha']);
        });
    $yourArray[$key] = $subarray;
 }

print_r($yourArray);

Answer 2

尝试：

    foreach ($yourArray as $key => &$subarray) {
        usort($subarray, function($a, $b) {
            return $a['fecha'] <= $b['fecha'];
        });
    }
    print_r($yourArray); //now it's sorted

按键数组多维排序

2 个答案: