Change array order according to value in php

Question

I have an array and I want change it's order. Following is an my array

        [1] => Array
                (
                    [A] => 25/02/2016
                    [B] => ZPO
                    [C] => 2
                    [D] => 3
                 )
        [2] =>array (
                    [A] => 25/02/2016
                    [B] => RTN
                    [C] => 2
                    [D] => 3
                )  
       [3] =>array (
                    [A] => 25/02/2016
                    [B] => ZPO
                    [C] => 2
                    [D] => 3
                )

index [2] array should be come at last because it contains value [B] = RTN Means I want to reorder this array if [B] index contains value RTN should be come at last

Final output should be

  [1] => Array
                    (
                        [A] => 25/02/2016
                        [B] => ZPO
                        [C] => 2
                        [D] => 3
                     )
            [2] =>array (
                        [A] => 25/02/2016
                        [B] => ZPO
                        [C] => 2
                        [D] => 3
                    )  
           [3] =>array (
                        [A] => 25/02/2016
                        [B] => RTN
                        [C] => 2
                        [D] => 3
                    )

what is the business logic of this reordering?otherwise just grab the arraykey & unset them & then push into the array again — Dipanwita Kundu, Sep 29 '16 at 10:19

somnium · Answer 1 · 2016-09-29T10:22:40.730

2

You can use usort and provide a function:

usort(
  $array,
  // compare function for value 'B'.
  function($arr1, $arr2) { 
      // descending order ($arr2, $arr1). for ascending compare ($arr1, $arr2)
      return strcmp($arr2['B'], $arr1['B']);
  });

edited Sep 29 '16 at 10:22

answered Sep 29 '16 at 10:07

somnium

1,487
9
15

2

This sorts the arrays ascending, OP wants it descending. You need to switch `$arr1['B']` and `$arr2['B']` inside `strcmp()` – simon Sep 29 '16 at 10:16
Thanks. Fixed it accordingly! – somnium Sep 29 '16 at 10:23

atoms · Accepted Answer · 2016-09-29T10:35:37.930

2

Is this what your looking for?

foreach ($aArrayToSort as $iPos => $aArray) {
    if($aArray['B'] == 'RTN'){
        $aArrayToSort[] = $aArrayToSort[$iPos];
        unset($aArrayToSort[$iPos]);
    }
}

edited Sep 29 '16 at 10:35

answered Sep 29 '16 at 10:08

atoms

2,993
2
22
43

I want that RTN records. I dont want to unset that – Tejas Khutale Sep 29 '16 at 10:34
1

I'm adding it to the end of the array then removing it. Saved storing it in a temp var. UPDATE - noticed an error in code, see what your saying now.. Updated accordingly – atoms Sep 29 '16 at 10:34

Change array order according to value in php

2 Answers2