Sorting row values in each subarray of a 2d array

Question

I have an array like so

array:2 [▼
  "folder1" => array:3 [▼
    1 => "d1_2.png"
    2 => "d1_1.png"
    3 => "d1_3.png"
  ]
  "folder2" => array:3 [▼
    0 => "d2_2.png"
    1 => "d2_3.png"
    3 => "d2_1.png"
  ]
]

What I am trying to do is sort this array based on the value. So the output should be something like this

array:2 [▼
  "folder1" => array:3 [▼
    0 => "d1_1.png"
    1 => "d1_2.png"
    2 => "d1_3.png"
  ]
  "folder2" => array:3 [▼
    0 => "d1_1.png"
    1 => "d1_2.png"
    2 => "d1_3.png"
  ]
]

All examples I have seen sort based on a key value, but I do not have keys. I have tried several sort functions but none of them seem to sort the array.

How can I sort it based on the array I have?

Sorry, what I meant was that my keys are indexes, not a representation. — katie hudson
– katie hudson, Commented Jul 15, 2016 at 8:51

Xyz · Accepted Answer · 2016-07-15 08:59:51Z

1

There are a huge number of sorting functions in php, which can sort an array based on value or key, maintain index association and walk into child arrays.

What I think you want is the sort function, like this:

sort($array['folder1']);
sort($array['folder2']);

Or this:

foreach ($array as $key => $subarray) {
    sort($array[$key]);
}

Just keep in mind. It is not the outer array you want to sort, but its child arrays.

edited Jul 15, 2016 at 8:59

answered Jul 15, 2016 at 8:54

Xyz

6,0416 gold badges43 silver badges60 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

katie hudson Over a year ago

Because I do not know the folder names I would need to go with the second option. If I output subarray I can see that it works. However, it does not seem to add the sorted subarray back to the original array.

Xyz Over a year ago

Please note that I updated my answer. Just doing a sort($subarray) will only sort a copy of the child arrays. You will actually have to do a sort($array[$key]), like the updated answer instead.

Pramod Kharade · Accepted Answer · 2016-07-15 08:51:35Z

1

You can use this function:

asort() - sort associative arrays in ascending order, according to the value

answered Jul 15, 2016 at 8:51

Pramod Kharade

2,0951 gold badge26 silver badges41 bronze badges

1 Comment

katie hudson Over a year ago

That is actualt one of the functions I tried, but it does not seem to sort it because I think it is doing the sort on folder1 and folder2.

Mr Magnum · Accepted Answer · 2016-07-15 09:04:04Z

1

use array_walk (functional way of foreach) to go through the outer array and then in there use sort

http://php.net/manual/en/function.array-walk.php
http://php.net/manual/en/function.sort.php

$arr = array(
    "folder1" => array(
        "1" => "d1_2",
        "2" => "d1_1",
        "3" => "d1_3"
    ),
    "folder2" => array(
        "1" => "d2_3",
        "2" => "d2_1",
        "3" => "d2_2"
    )
);

var_dump($arr);

array_walk($arr, function (&$e) {
    sort($e);
});

var_dump($arr);

edited Jul 15, 2016 at 9:04

answered Jul 15, 2016 at 8:58

Mr Magnum

215 bronze badges

Collectives™ on Stack Overflow

Sorting row values in each subarray of a 2d array

3 Answers 3

2 Comments

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related