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
– Dipanwita Kundu, Commented Sep 29, 2016 at 10:19

atoms · Accepted Answer · 2016-09-29 10:35:37Z

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, 2016 at 10:35

answered Sep 29, 2016 at 10:08

atoms

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2 Comments

Tejas Khutale Over a year ago

I want that RTN records. I dont want to unset that

atoms Over a year ago

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

somnium · Accepted Answer · 2016-09-29 10:22:40Z

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, 2016 at 10:22

answered Sep 29, 2016 at 10:07

somnium

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2 Comments

simon Over a year ago

This sorts the arrays ascending, OP wants it descending. You need to switch $arr1['B'] and $arr2['B'] inside strcmp()

somnium Over a year ago

Thanks. Fixed it accordingly!

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