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Sort by Date


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I have the following array, I want to sort by Date, from latest to oldest. How can I do that

	$array = array(
		0 => array(
			'id' => 5952,
			'points' => 15,
			'result' => 'W',
			'date' => 'Jan. 2, 22',
		),
		1 => array(
			'id' => 5965,
			'points' => 6,
			'result' => 'L',
			'date' => 'Jan. 1, 22',
		),
	);

 

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that date format is not directly sortable. where is this data coming from/stored at?

you should store dates in a YYYY-MM-DD format, which will allow easy sorting by the date, then output the date in the format that you want when you display it.

if this data is coming from a database, sort it in the sql query.

if this data must be sorted in php, you would use php's usort() function, with a call-back function to sort on the date field. if that  incoming date format cannot be corrected at the source, i would first convert the format, all at once, to be YYYY-MM-DD, then sort the data, then format the date back to that format when you display it.

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  • Solution

Example

$arr = [
          [ 'A', 'Jan. 22, 22'],
          [ 'B', 'Dec. 25, 21'],
          [ 'C', 'Feb. 22, 22'],
          [ 'D', 'Jan. 2, 22']
       ];
usort($arr, function($a, $b) {
               $da = DateTime::createFromFormat('M. j, y', $a[1]);
               $db = DateTime::createFromFormat('M. j, y', $b[1]);
               return $db <=> $da;
            });
echo '<pre>' . print_r($arr, 1) . '</pre>';

outputs

Array
(
    [0] => Array
        (
            [0] => C
            [1] => Feb. 22 22
        )

    [1] => Array
        (
            [0] => A
            [1] => Jan. 22 22
        )

    [2] => Array
        (
            [0] => D
            [1] => Jan. 2 22
        )

    [3] => Array
        (
            [0] => B
            [1] => Dec. 25 21
        )

)

 

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6 hours ago, mac_gyver said:

that date format is not directly sortable. where is this data coming from/stored at?

you should store dates in a YYYY-MM-DD format, which will allow easy sorting by the date, then output the date in the format that you want when you display it.

if this data is coming from a database, sort it in the sql query.

if this data must be sorted in php, you would use php's usort() function, with a call-back function to sort on the date field. if that  incoming date format cannot be corrected at the source, i would first convert the format, all at once, to be YYYY-MM-DD, then sort the data, then format the date back to that format when you display it.

Thank you. 

I got it to work. 

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