PHP re-order sequence of arrays within an array

Question

Hello i'm using PHP and I'm stuck trying to re-order an arrays with an array as per below i.e. I want contents of key[0] to move to key [1] and the contents of key [1] to move to key [0]. Anyone able to provide some PHP code for this ?

****Current Array containing Arrays****

Array([0] => Array (
          [name] => 1.jpeg, 
          [type] => image/jpeg, 
          [tmp_name] => C:\fakefolder\fakename1.tmp, 
          [error] => 0, 
          [size] => 1000
         ),
      [1] => Array (
          [name] => 2.jpeg, 
          [type] => image/jpeg, 
          [tmp_name] => C:\fakefolder\fakename2.tmp, 
          [error] => 0, 
          [size] => 2000
        )
     )

****Want to re-order arrays within the array like this****

Array( [0] => Array (
         [name] => 2.jpeg,
         [type] => image/jpeg,
         [tmp_name] => C:\fakefolder\fakename2.tmp,
         [error] => 0,
         [size] => 2000
       ),
      [1] => Array ( 
         [name] => 2.jpeg,
         [type] => image/jpeg, 
         [tmp_name] => C:\fakefolder\fakename2.tmp, 
         [error] => 0, 
         [size] => 2000
      )
   )

You could do [$array[0], $array[1]] = [$array[1], $array[0]]; — Jeto
– Jeto, Commented Dec 13, 2019 at 18:24
See this can help you. stackoverflow.com/questions/11282592/… — Avinash Dalvi
– Avinash Dalvi, Commented Dec 13, 2019 at 18:49

Aran · Accepted Answer · 2019-12-13 20:13:51Z

It's not clear from your question if you simply want to reverse the array key order? If so, you can just use array_reverse() for this.

Alternatively, if there's a pair of array keys you're trying to specifically swap, here's a function you can use that'll do exactly that for you:

/**
 * Swaps two array keys over in the provided array
 *
 * @param array $array
 * @param mixed $keyA
 * @param mixed $keyB
 */
function swapArrayKeys(array &$array, $keyA, $keyB)
{
    if (!isset($array[$keyA], $array[$keyB])) {
        throw new InvalidArgumentException('One or more keys are missing from your array');
    }

    $a = $array[$keyA];

    $array[$keyA] = $array[$keyB];
    $array[$keyB] = $a;
}

Example usage:

<?php

$inputArray = [
    [
        'name' => '1.jpeg',
        'type' => 'image/jpeg',
        'tmp_name' => 'C:\fakefolder\fakename1.tmp',
        'error' => 0,
        'size' => 1000
    ],
    [
        'name' => '2.jpeg',
        'type' => 'image/jpeg',
        'tmp_name' => 'C:\fakefolder\fakename2.tmp',
        'error' => 0,
        'size' => 2000
    ],
    [
        'name' => '3.jpeg',
        'type' => 'image/jpeg',
        'tmp_name' => 'C:\fakefolder\fakename3.tmp',
        'error' => 0,
        'size' => 3000
    ],
];

// Swap elements 1 and 3 in the array (keys 0 and 2 due to arrays being zero indexed)
swapArrayKeys($inputArray, 0, 2);

// Output the new array
print_r($inputArray);

/**
 * Swaps two array keys over in the provided array
 *
 * @param array $array
 * @param mixed $keyA
 * @param mixed $keyB
 */
function swapArrayKeys(array &$array, $keyA, $keyB)
{
    if (!isset($array[$keyA], $array[$keyB])) {
        throw new InvalidArgumentException('One or more keys are missing from your array');
    }

    $a = $array[$keyA];

    $array[$keyA] = $array[$keyB];
    $array[$keyB] = $a;
}

Console output:

Array
(
    [0] => Array
        (
            [name] => 3.jpeg
            [type] => image/jpeg
            [tmp_name] => C:\fakefolder\fakename3.tmp
            [error] => 0
            [size] => 3000
        )

    [1] => Array
        (
            [name] => 2.jpeg
            [type] => image/jpeg
            [tmp_name] => C:\fakefolder\fakename2.tmp
            [error] => 0
            [size] => 2000
        )

    [2] => Array
        (
            [name] => 1.jpeg
            [type] => image/jpeg
            [tmp_name] => C:\fakefolder\fakename1.tmp
            [error] => 0
            [size] => 1000
        )

)

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