How can I sort the keys of a multidimensional array?

Question

array(1) {
  [0]=>
  array(1) {
    ["12345"]=>
    array(1) {
      ["orange"]=>
      string(46) "test.jpg"
      ["blue"]=>
      string(46) "test2.jpg"
      ["green"]=>
      string(46) "test3.jpg"
    }
  }
}

I want to sort it by key:

foreach ($array as $key => $value) {
      if(is_array($value)){
           foreach ($value as $k => $v) {
                usort($v);
                foreach ($v as $fileIterator => $fileData) {
                     echo $fileIterator;
                }
           }
      }
 }

This is the result

orange
blue
green

But I expect the order to be

blue
green
orange

change this `$value as $k => $v` to `$value as $k => &$v` and `ksort()` not `usort()` — Abhishek, May 24 '18 at 12:36
Possible duplicate of [Sort PHP multi-dimensional array based on key?](https://stackoverflow.com/questions/16306416/sort-php-multi-dimensional-array-based-on-key) — R B, May 24 '18 at 12:36
No this is not a dublicate. Because This question is sorting the values not the key — peace_love, May 24 '18 at 12:37
@Jarla you will be sorting key only at the end. Not the value. The value itself is a array. — Abhishek, May 24 '18 at 12:38
Possible duplicate of [Sort Multi-dimensional Array by Value](https://stackoverflow.com/questions/2699086/sort-multi-dimensional-array-by-value) — William Perron, May 24 '18 at 12:39

Abhishek · Accepted Answer · 2018-05-24T12:42:31.107

2

Try this, You have to sort based on key so use ksort(). While using foreach() the duplicate of array is processed. In order to make changes in original array use '&'(calling by reference)

foreach ($array as $key => $value) {
      if(is_array($value)){
           foreach ($value as $k => &$v) {
                ksort($v);
                foreach ($v as $fileIterator => $fileData) {
                     echo $fileIterator;
                }
           }
      }
 }

edited May 24 '18 at 12:42

answered May 24 '18 at 12:40

Abhishek

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1

@IncredibleHat was about to add that. Thanks for pointing it out though.! – Abhishek May 24 '18 at 12:43

How can I sort the keys of a multidimensional array?

1 Answers1