How to sort date array in php?

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If the date is in “Mysql” format (Y-m-d or Y-m-d H:i:s), then you can sort your array right away, no special action needed:

$arr = ["2019-11-11", "2019-10-10","2019-11-11", "2019-09-08","2019-05-11"];
sort($arr);

If the date is localized or formatted anyhow (that you should avoid, formatting the date only before output) you have to use a custom sorting function, such as usort(), that will convert the dates into sortable format before comparison.

The simplest way to convert a date into sortable format is to convert it into uninx timestamp using strtotime() function:

$arr = ['11/01/2012', '03/16/2022', '12/26/2021', '01/01/2014', '09/02/2013'];
usort($arr, function ($a, $b) {
    return strtotime($a) - strtotime($b);
});
print_r($arr);

Check result in demo

However, there could be pitfalls, because in different countries the same date format could mean a different date. Which is exactly the case with your example format, for which the above function will return wrong results if dates are ['03-16-2022', '12-26-2021', '06-06-2022']. Therefore it’s better to define the date format explicitly, as explained in this answer

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