How to preserve original unique array keys while using array_chunk?

Question

I have an array of objects, each keyed by a unique random ID.

111 => 
    object(stdClass)[452]
      public 'Description' => string 'Description here...' (length=728)       
      public 'Name' => string 'Shirt' (length=18)
      public 'Price' => float 36.56

222 => 
    object(stdClass)[452]
      public 'Description' => string 'Description here...' (length=728)       
      public 'Name' => string 'Pants' (length=18)
      public 'Price' => float 36.56

333 => 
    object(stdClass)[452]
      public 'Description' => string 'Description here...' (length=728)       
      public 'Name' => string 'Dress' (length=18)
      public 'Price' => float 36.56

444 => 
    object(stdClass)[452]
      public 'Description' => string 'Description here...' (length=728)       
      public 'Name' => string 'Dress' (length=18)
      public 'Price' => float 36.56

...

My goal is to split my keyed arrays of objects into chunks of 2 for pagination purposes. So something like this would do:

0 =>
    111 => 
        object(stdClass)[452]
          public 'Description' => string 'Description here...' (length=728)           
          public 'Name' => string 'Shirt' (length=18)
          public 'Price' => float 36.56

    222 => 
        object(stdClass)[452]
          public 'Description' => string 'Description here...' (length=728)           
          public 'Name' => string 'Pants' (length=18)
          public 'Price' => float 36.56
1 =>
    333 => 
        object(stdClass)[452]
          public 'Description' => string 'Description here...' (length=728)           
          public 'Name' => string 'Dress' (length=18)
          public 'Price' => float 36.56

    444 => 
        object(stdClass)[452]
          public 'Description' => string 'Description here...' (length=728)          
          public 'Name' => string 'Dress' (length=18)
          public 'Price' => float 36.56
...

My problem is by using array_chunk() to split up my arrays of objects into groups of 2, my unique ID's are not being preserved.

private function paginate($array)
{
    $chunks = 2;
    $paginatedResults = array_chunk($array, $chunks);

    return $paginatedResults;
}

Function Output:

0 =>
    0 => 
        object(stdClass)[452]
          public 'Description' => string 'Description here...' (length=728)
          public 'Name' => string 'Shirt' (length=18)
          public 'Price' => float 36.56

    1 => 
        object(stdClass)[452]
          public 'Description' => string 'Description here...' (length=728)
          public 'Name' => string 'Pants' (length=18)
          public 'Price' => float 36.56
1 =>
    0 => 
        object(stdClass)[452]
          public 'Description' => string 'Description here...' (length=728)
          public 'Name' => string 'Dress' (length=18)
          public 'Price' => float 36.56

    1 => 
        object(stdClass)[452]
          public 'Description' => string 'Description here...' (length=728)
          public 'Name' => string 'Dress' (length=18)
          public 'Price' => float 36.56
...

How can I split up my keyed array of objects into another array containing 2 objects per index while preserving my original array keys containing the unique ID?

Preserving keys is mentioned at splitting a multidimensional array in php — mickmackusa
– mickmackusa ♦, Commented Mar 21, 2023 at 6:30

Aleksei Matiushkin · Accepted Answer · 2014-12-03 16:05:25Z

39

All I had to do was set the third parameter of array_chunk() to true like so:

$paginatedResults = array_chunk($array, $chunk, true);

edited Dec 3, 2014 at 16:05

Aleksei Matiushkin

121k12 gold badges109 silver badges173 bronze badges

answered Dec 3, 2014 at 16:04

Fetus

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Comments

VolkerK · Accepted Answer · 2014-12-03 16:05:54Z

Seems like the third parameter of array array_chunk ( array $input , int $size [, bool $preserve_keys = false ] ) controls exactly that.

<?php
$x = array_flip(range('a','j'));
var_dump($x);
var_dump(array_chunk($x, 3, true));

prints

array(10) {
  ["a"]=>
  int(0)
  ["b"]=>
  int(1)
  ["c"]=>
  int(2)
  ["d"]=>
  int(3)
  ["e"]=>
  int(4)
  ["f"]=>
  int(5)
  ["g"]=>
  int(6)
  ["h"]=>
  int(7)
  ["i"]=>
  int(8)
  ["j"]=>
  int(9)
}
array(4) {
  [0]=>
  array(3) {
    ["a"]=>
    int(0)
    ["b"]=>
    int(1)
    ["c"]=>
    int(2)
  }
  [1]=>
  array(3) {
    ["d"]=>
    int(3)
    ["e"]=>
    int(4)
    ["f"]=>
    int(5)
  }
  [2]=>
  array(3) {
    ["g"]=>
    int(6)
    ["h"]=>
    int(7)
    ["i"]=>
    int(8)
  }
  [3]=>
  array(1) {
    ["j"]=>
    int(9)
  }
}

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