在PHP或MySQL中按日期（月年）排序

Question

I have checked everywhere on SOF, but unable to find solution for it. I have date which is month and year like this coming from mysql. My sql query is using date format like this DATE_FORMAT( month, '%m %Y' )

[0] => Array
        (
            [month] => 12 2016
            [bundle_Price] => 6000
        )

[1] => Array
        (
            [month] => 07 2017
            [bundle_Price] => 1200
        )

Here is my sort function..

$MyResult = Company::Sorting($Result,'month');


public static function vpbxSorting_2($a,$subkey) {
    foreach($a as $k=>$v) {
        $b[$k] = strtolower($v[$subkey]);
    }
    asort($b, 1);
    foreach($b as $key=>$val) {
        $c[] = $a[$key];
    }
    return $c;
}

It gives me sorting like this which is not correct..

print_r($MyResult );

Sort below:

Array
(
    [0] => Array
        (
            [month] => 01 2017
            [bundle_Price] => 1200
        )

    [1] => Array
        (
            [month] => 02 2017
            [bundle_Price] => 7200
        )

    [2] => Array
        (
            [month] => 04 2017
            [bundle_Price] => 1200
        )

    [3] => Array
        (
            [month] => 04 2016
            [bundle_Price] => 7200
        )

    [4] => Array
        (
            [month] => 05 2017
            [bundle_Price] => 1200
        )

    [5] => Array
        (
            [month] => 05 2016
            [bundle_Price] => 13200
        )

    [6] => Array
        (
            [month] => 06 2017
            [bundle_Price] => 9600
        )

    [7] => Array
        (
            [month] => 06 2016
            [bundle_Price] => 6000
        )

    [8] => Array
        (
            [month] => 07 2017
            [bundle_Price] => 14400
        )

    [9] => Array
        (
            [month] => 07 2016
            [bundle_Price] => 6000
        )

    [10] => Array
        (
            [month] => 08 2017
            [bundle_Price] => 1200
        )

    [11] => Array
        (
            [month] => 08 2016
            [bundle_Price] => 6000
        )

    [12] => Array
        (
            [month] => 09 2016
            [bundle_Price] => 17500
        )

    [13] => Array
        (
            [month] => 10 2016
            [bundle_Price] => 1200
        )

    [14] => Array
        (
            [month] => 12 2016
            [bundle_Price] => 6000
        )

)

but i want it to sort like by MonthYear in DESC order... The order in above array is not correct after sorting..

The below sort order is in Desc order of month and year.

.. so on....
[month] => 03 2017
[month] => 02 2017
[month] => 01 2017
[month] => 12 2016
[month] => 11 2016
[month] => 10 2016
[month] => 09 2016
... so on...

I want to order by [month] field in array, not by [bundle_price ], But bundle_price should be there in array.

Answer 1

You need to do few steps to achieve this.

Make strtotime of each month variable and then do sort.

$tempArray = [];
for($x = 0; $x < count($myResult); $x++){
    $tempArray[strtotime($myResult['month])] = $myResult[$x];
}

In tempArray you will be having keys of only strtotime result of each month. Now you need to do sory.

$keys = sort(array_keys($tempArray));

Now you can print_r($myResult) and the result will be as per your expectation.

Answer 2

Is it too late to change your data format?

YYYY MM would greatly simplify your task.

Then you can just ORDER BY DATE (DESC)

In fact, making it an INT, rather than a string would be more efficient & still easy to format in PHP for display.