php sort by key multidimentional array

Question

Supposed I have an array of

array(8) {
  [0] =>
  array(1) {
    'Peter' =>
    int(4)
  }
  [1] =>
  array(1) {
    'Piper' =>
    int(4)
  }
  [2] =>
  array(1) {
    'picked' =>
    int(4)
  }
  [3] =>
  array(1) {
    'peck' =>
    int(4)
  }
  [4] =>
  array(1) {
    'pickled' =>
    int(4)
  }

How can I sort this multidimentional array by key example (Peter). I tried using

ksort($arr);

but it just return a boolean

The output that I want

array(8) {
      [0] =>
      array(1) {
        'peck' =>
        int(4)
      }
      [1] =>
      array(1) {
        'Peter' =>
        int(4)
      }
      [2] =>
      array(1) {
        'picked' =>
        int(4)
      }
      [3] =>
      array(1) {
        'pickled' =>
        int(4)
      }
      [4] =>
      array(1) {
        'piper' =>
        int(4)
    }

the array should be sorted by key and in ascending order.

print your array using print_r($arr) function and show your output here — Ankur Tiwari, Aug 27 '19 at 06:30
I tried different functions like array_multisort, ksort but it just return a bolean of true — Beginner, Aug 27 '19 at 06:31
Possible duplicate of [How can I sort arrays and data in PHP?](https://stackoverflow.com/questions/17364127/how-can-i-sort-arrays-and-data-in-php) — misorude, Aug 27 '19 at 06:32
What is the expected output and why is it that way? I don't understand ***How can I sort this multidimentional array by key example (Peter).*** — Andreas, Aug 27 '19 at 06:33

LF00 · Answer 1 · 2019-08-27T07:09:36.857

1

Sort with usort like this, check the demo

usort($array,function($a,$b){
    return strcmp(strtolower(key($a)),strtolower(key($b)));
});

edited Aug 27 '19 at 07:09

answered Aug 27 '19 at 06:39

LF00

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@Beginner check the demo in the answer. – LF00 Aug 27 '19 at 06:52
why peter is on the first index it should be peck – Beginner Aug 27 '19 at 06:54
For upper case `P` is less than lower case `p` – LF00 Aug 27 '19 at 06:57
Is it possible to sort it regardless of its case? i just want to display it on alphabetical order – Beginner Aug 27 '19 at 07:03
@Beginner yes, check the demo. – LF00 Aug 27 '19 at 07:09

score 0 · Answer 2 · answered Aug 27 '19 at 06:56

The ksort() method does an in-place sort. So while it only returns a boolean (as you correctly state), it mutates the values inside $arr to be in the sorted order. Note that based on your expected output, it looks like you want to do a case insensitive search. For that, you need to use the SORT_FLAG_CASE sort flag. So, instead of calling ksort($arr), you instead want to use ksort($arr, SORT_FLAG_CASE). You can see how ksort() uses sort flags, in the sort() method's documentation. Hope that helps!

score 0 · Answer 3 · answered Aug 27 '19 at 07:13

You can do something like this,

$temp = array_map(function($a){
    return key($a); // fetching all the keys
}, $arr);
natcasesort($temp); // sorting values case insensitive
$result = [];
// logic of sorting by other array
foreach($temp as $v){
    foreach($arr as $v1){
        if($v == key($v1)){
            $result[] = $v1;
            break;
        }        
    }
}

Demo

Output

Array
(
    [0] => Array
        (
            [peck] => 4
        )

    [1] => Array
        (
            [Peter] => 4
        )

    [2] => Array
        (
            [picked] => 4
        )

    [3] => Array
        (
            [pickled] => 4
        )

    [4] => Array
        (
            [Piper] => 4
        )

)

php sort by key multidimentional array

3 Answers3