How to re-index all subarray elements of a multidimensional array?

Question

The question is how to reset key e.g. for an array:

Array ( 
    [1_Name] => Array ( 
        [1] => leo 
        [4] => NULL 
    ) 
    [1_Phone] => Array ( 
        [1] => 12345 
        [4] => 434324
    )  
)

reset to :

Array ( 
    [1_Name] => Array ( 
        [0] => leo 
        [1] => NULL 
    ) 
    [1_Phone] => Array ( 
        [0] => 12345 
        [1] => 434324
    ) 
)

Check this answer: http://stackoverflow.com/questions/5943149/rebase-array-keys-after-unsetting-elements/24332702#24332702 — Web_Developer, Jun 20 '14 at 17:36

score 322 · Accepted Answer · edited Jun 07 '18 at 19:04

322

To reset the keys of all arrays in an array:

$arr = array_map('array_values', $arr);

In case you just want to reset first-level array keys, use array_values() without array_map.

edited Jun 07 '18 at 19:04

Riz-waan

593
2
12

answered May 08 '12 at 05:09

deceze

491,798
79
706
853

12

Didn't reset the keys of my array for some reason, had to use just the `array_values` function. – SSH This Mar 01 '13 at 20:30
1

@SSH Did you use it on an *array of arrays*, as was called for here? – deceze Mar 01 '13 at 21:31
1

Nope that was the problem, I thought this was supposed to "Reset the keys of array elements", it doesn't. – SSH This Mar 01 '13 at 22:34
3

you dont need to use array_map: $ret = array_values($ret); is enough to reset numeric keys – Marek Lewandowski May 07 '13 at 08:24
@Marek Not if you need to reset the keys of *arrays in arrays*. – deceze May 07 '13 at 08:26
2

I dont know if the use of array_values for resetting values is documented, but it should be. This really helped cut down on the number of lines I was writing :) – carbontwelve Sep 21 '13 at 14:47

score 220 · Answer 2 · answered May 08 '12 at 05:11

$array[9] = 'Apple';
$array[12] = 'Orange';
$array[5] = 'Peach';

$array = array_values($array);

through this function you can reset your array

$array[0] = 'Apple';
$array[1] = 'Orange';
$array[2] = 'Peach';

score 21 · Answer 3 · answered May 08 '12 at 05:09

21

Use array_values to reset keys

foreach($input as &$val) {
   $val = array_values($val);
}

http://php.net/array_values

answered May 08 '12 at 05:09

Andreas Wong

57,842
19
104
123

score 11 · Answer 4 · edited May 23 '17 at 11:47

Here you can see the difference between the way that deceze offered comparing to the simple array_values approach:

The Array:

$array['a'][0] = array('x' => 1, 'y' => 2, 'z' => 3);
$array['a'][5] = array('x' => 4, 'y' => 5, 'z' => 6);

$array['b'][1] = array('x' => 7, 'y' => 8, 'z' => 9);
$array['b'][7] = array('x' => 10, 'y' => 11, 'z' => 12);

In deceze way, here is your output:

$array = array_map('array_values', $array);
print_r($array);

/* Output */

Array
(
    [a] => Array
        (
            [0] => Array
                (
                    [x] => 1
                    [y] => 2
                    [z] => 3
                )
            [1] => Array
                (
                    [x] => 4
                    [y] => 5
                    [z] => 6
                )
        )
    [b] => Array
        (
            [0] => Array
                (
                    [x] => 7
                    [y] => 8
                    [z] => 9
                )

            [1] => Array
                (
                    [x] => 10
                    [y] => 11
                    [z] => 12
                )
        )
)

And here is your output if you only use array_values function:

$array = array_values($array);
print_r($array);

/* Output */

Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [x] => 1
                    [y] => 2
                    [z] => 3
                )
            [5] => Array
                (
                    [x] => 4
                    [y] => 5
                    [z] => 6
                )
        )
    [1] => Array
        (
            [1] => Array
                (
                    [x] => 7
                    [y] => 8
                    [z] => 9
                )
            [7] => Array
                (
                    [x] => 10
                    [y] => 11
                    [z] => 12
                )
        )
)

score 6 · Answer 5 · answered Aug 19 '15 at 15:51

6

$result = ['5' => 'cherry', '7' => 'apple'];
array_multisort($result, SORT_ASC);
print_r($result);

Array ( [0] => apple [1] => cherry )

//...
array_multisort($result, SORT_DESC);
//...

Array ( [0] => cherry [1] => apple )

answered Aug 19 '15 at 15:51

Skit

61
1
4

score -7 · Answer 6 · edited Mar 29 '15 at 14:45

-7

PHP native function exists for this. See http://php.net/manual/en/function.reset.php

Simply do this: mixed reset ( array &$array )

edited Mar 29 '15 at 14:45

ZygD

10,844
36
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answered Mar 29 '15 at 13:35

William Espindola

31
1
6

4

Please do read the manual you're linking to; `reset` does something else. – deceze Mar 29 '15 at 13:40
It's just move pointer to first element of array. Topicstarter searching way to drop keys in default state 0, 1, 2...N. – SlowSuperman Feb 01 '19 at 11:06

How to re-index all subarray elements of a multidimensional array?

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