如何在php中对数组中的日期进行排序？

这是我的数组，我希望按月份和日期进行排序，如

Array
(
    [0] => 01_January_2020
    [1] => 02_December_2019
    [2] => 02_January_2020
    [3] => 03_December_2019
    [4] => 03_January_2020
    [5] => 04_December_2019
    [6] => 04_January_2020
    [7] => 05_December_2019
    [8] => 05_January_2020
    [9] => 06_December_2019
    [10] => 06_January_2020
    [11] => 07_December_2019
    [12] => 07_January_2020
    [13] => 08_December_2019
    [14] => 08_January_2020
    [15] => 09_December_2019
    [16] => 09_January_2020
    [17] => 10_December_2019
    [18] => 10_January_2020
    [19] => 11_December_2019
    [20] => 11_January_2020
    [21] => 12_December_2019
    [22] => 12_January_2020
    [23] => 13_December_2019
    [24] => 13_January_2020
    [25] => 14_December_2019
    [26] => 14_January_2020
    [27] => 15_December_2019
    [28] => 15_January_2020
    [29] => 16_December_2019
    [30] => 16_January_2020
    [31] => 17_December_2019
    [32] => 17_January_2020
    [33] => 18_December_2019
    [34] => 18_January_2020
    [35] => 19_December_2019
    [36] => 19_January_2020
    [37] => 20_December_2019
    [38] => 20_January_2020
    [39] => 21_December_2019
    [40] => 22_December_2019
    [41] => 23_December_2019
    [42] => 24_December_2019
    [43] => 25_December_2019
    [44] => 26_December_2019
    [45] => 27_December_2019
    [46] => 28_December_2019
    [47] => 29_December_2019
    [48] => 30_December_2019
    [49] => 31_December_2019
)

---

我尝试了这么多方法，但没有得到任何结果。有人能帮我解决这个问题吗？

您可以使用

usort（）

和一个从该格式创建datetime对象的回调来创建自己的排序函数（因为

d\u\u Y

不是一种可识别的格式，您必须使用

createFromFormat（）

）。一旦你有了一个合适的datetime对象，你就可以对它们进行比较，并将它们按正确的顺序排列（通过比较时间戳，

format（“U”）

，很容易做到这一点）

---

$arr\u dates

是您的日期数组

usort($yourArray, function($a, $b) {
    $format = "d_F_Y";
    $a = DateTime::createFromFormat($format, $a);
    $b = DateTime::createFromFormat($format, $b);
    return $a->format("U") - $b->format("U");
});

$final_date=array（）；
foreach（$arr_日期为$str_日期）{
/*要删除下划线（41;*/
$date=str_替换（“”，“”，$str_日期）；
$final_date[标准时间（$date）]=$date；
}
ksort（最终日期）；
回声'；
打印日期（最终日期）；

---

希望这对您有所帮助。

欢迎来到Stackoverflow。请提供您尝试过的方法，以便其他人可以改进。

usort($yourArray, function($a, $b) {
    $format = "d_F_Y";
    $a = DateTime::createFromFormat($format, $a);
    $b = DateTime::createFromFormat($format, $b);
    return $a->format("U") - $b->format("U");
});

$final_date = array();
foreach ($arr_dates as $str_date) {
    /* to remove underscore ( _ ) */
    $date = str_replace('_', ' ', $str_date); 
    $final_date[strtotime($date)] = $date;
}
ksort($final_date);
echo '<pre>';
print_r($final_date);