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  1. <?php 
  2.  
  3. $arr = array(
  4.     1 => array(
  5.         1 => '11/05/2013',
  6.         2 => 'Executive Planning Day'
  7.     ),
  8.     2 => array(
  9.         1 => '13/06/2013',
  10.         2 => 'Middle Leaders Planning Day'
  11.     ),
  12.     3 => array(
  13.         1 => '12/07/2013',
  14.         2 => 'New Staff Induction Day'
  15.     ),
  16.     4 => array(
  17.         1 => '13/04/2013',
  18.         2 => 'Staff Conference Day No. 1'
  19.     ),
  20.     5 => array(
  21.         1 => '14/04/2013',
  22.         2 => 'Staff Conference Day No. 2'
  23.     ),
  24.     6 => array(
  25.         1 => '15/02/2013',
  26.         2 => 'Staff Conference Day No. 3'
  27.     ),
  28.     7 => array(
  29.         1 => '16/03/2013',
  30.         2 => 'Australia Day'
  31.     )
  32. );
  33.  
  34. uasort($arr, function($a, $b){
  35.     $format = 'd/m/Y'; 
  36.     $ascending = false;
  37.     $zone = new DateTimeZone('UTC');
  38.     $d1 = DateTime::createFromFormat($format, $a[1], $zone)->getTimestamp();
  39.     $d2 = DateTime::createFromFormat($format, $b[1], $zone)->getTimestamp();
  40.     return $ascending ? ($d1 - $d2) : ($d2 - $d1);
  41. });
  42.  
  43. print_r($arr);
  44.  
Success #stdin #stdout 0.02s 20520KB
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Array
(
    [3] => Array
        (
            [1] => 12/07/2013
            [2] => New Staff Induction Day
        )

    [2] => Array
        (
            [1] => 13/06/2013
            [2] => Middle Leaders Planning Day
        )

    [1] => Array
        (
            [1] => 11/05/2013
            [2] => Executive Planning Day
        )

    [5] => Array
        (
            [1] => 14/04/2013
            [2] => Staff Conference Day No. 2
        )

    [4] => Array
        (
            [1] => 13/04/2013
            [2] => Staff Conference Day No. 1
        )

    [7] => Array
        (
            [1] => 16/03/2013
            [2] => Australia Day
        )

    [6] => Array
        (
            [1] => 15/02/2013
            [2] => Staff Conference Day No. 3
        )

)
https://ideone.com/5MjoTZ
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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