php 如何在php中对日期数组进行排序？
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How to sort date array in php?
提问by Mojilo
I am new to php, I have php date array
我是 php 新手，我有 php 日期数组
[0] => 11-01-2012
[1] => 01-01-2014
[2] => 01-01-2015
[3] => 09-02-2013
[4] => 01-01-2013
I want to sort it like :
我想对它进行排序：
[0] => 11-01-2012
[1] => 01-01-2013
[2] => 09-02-2013
[3] => 01-01-2014
[4] => 01-01-2015
I use asortbut not working.
我使用asort但不工作。
回答by d.coder
Because array items is string, you need to convert them to date and then comparing to sort. The usort()sort array using custom function that is a good sort function for this case.
由于数组项是字符串，因此您需要将它们转换为日期，然后进行比较以进行排序。usort()使用自定义函数的排序数组对于这种情况是一个很好的排序函数。
$arr = array('11-01-2012', '01-01-2014', '01-01-2015', '09-02-2013', '01-01-2013');
function date_sort($a, $b) {
return strtotime($a) - strtotime($b);
}
usort($arr, "date_sort");
print_r($arr);
Check result in demo
在演示中检查结果
回答by donald123
回答by Blinkydamo
Try this,
尝试这个，
<?php
$array = [ '11-01-2012', '01-01-2014', '01-01-2015', '09-02-2013', '01-01-2013' ];
function sortFunction( $a, $b ) {
return strtotime($a) - strtotime($b);
}
usort($array, "sortFunction");
var_dump( $array );
?>
Will sort the dates into the order you want.
将日期排序为您想要的顺序。
回答by Soni Vimalkumar
Try below code:
试试下面的代码：
<?php
$array = array('11-01-2012','01-01-2011','09-02-2013','01-01-2014','01-01-2015');
function cmp($a, $b)
{
$a = date('Y-m-d', strtotime($a));
$b = date('Y-m-d', strtotime($b));
if ($a == $b) {
return 0;
}
return ($a < $b) ? -1 : 1;
}
usort($array, "cmp");
foreach ($array as $key => $value) {
echo "[$key]=> $value <br>";
}
?>
回答by NAVNEET CHANDAN
You definitely can sort array to timestamps with the given code below, but I would like to drag your attention to the format of time I have used to store.. There are different benefits of storing time in such format. Read more about this here https://stackoverflow.com/a/59912185/7997043
您绝对可以使用下面给定的代码将数组排序为时间戳，但我想将您的注意力拖到我用来存储的时间格式上。以这种格式存储时间有不同的好处。在此处阅读更多相关信息https://stackoverflow.com/a/59912185/7997043
function compareByTimeStamp($a, $b ) {
return strtotime($b) - strtotime($a);
}
$arr = array("2020-02-11 00:00:00", "2020-02-13 00:00:00", "2020-02-08 00:00:00");
usort($arr, "compareByTimeStamp");
echo json_encode($arr);
回答by MaximeK
use DateTime for sorting date :
使用 DateTime 对日期进行排序：
$a = array(
new DateTime('2016-01-02'),
new DateTime('2016-05-01'),
new DateTime('2015-01-01'),
new DateTime('2016-01-01')
);
asort($a);
var_dump($a);
The output would be :
输出将是：
array(4) {
[2]=>
object(DateTime)#3 (3) {
["date"]=>
string(26) "2015-01-01 00:00:00.000000"
["timezone_type"]=>
int(3)
["timezone"]=>
string(10) "US/Pacific"
}
[3]=>
object(DateTime)#4 (3) {
["date"]=>
string(26) "2016-01-01 00:00:00.000000"
["timezone_type"]=>
int(3)
["timezone"]=>
string(10) "US/Pacific"
}
[0]=>
object(DateTime)#1 (3) {
["date"]=>
string(26) "2016-01-02 00:00:00.000000"
["timezone_type"]=>
int(3)
["timezone"]=>
string(10) "US/Pacific"
}
[1]=>
object(DateTime)#2 (3) {
["date"]=>
string(26) "2016-05-01 00:00:00.000000"
["timezone_type"]=>
int(3)
["timezone"]=>
string(10) "US/Pacific"
}
}
