How to convert multi-dimensional array into one-dimensional array

Question

I have below array with multi dimensional array. How I can convert it into one dimensional array.

Array
(
    [0] => Array
        (
            [id] => 21134
        )

    [1] => Array
        (
            [id] => 21135
        )

    [2] => Array
        (
            [id] => 21137
        )

    [3] => Array
        (
            [id] => 21138
        )

    [4] => Array
        (
            [id] => 21144
        )

    [5] => Array
        (
            [id] => 21147
        )

    [6] => Array
        (
            [id] => 21149
        )

    [7] => Array
        (
            [id] => 21150
        )

    [8] => Array
        (
            [id] => 21151
        )

    [9] => Array
        (
            [id] => 21152
        )

    [10] => Array
        (
            [id] => 21153
        )

)

Go through this [https://stackoverflow.com/questions/5009759/removing-an-outer-array](https://stackoverflow.com/questions/5009759/removing-an-outer-array) — Shubham Baranwal, Oct 30 '18 at 09:22
this might help you: [https://stackoverflow.com/questions/8754980/how-to-convert-two-dimensional-array-to-one-dimensional-array-in-php5] — Naveed Ali, Oct 30 '18 at 09:23
My expected output should be like Array ( [0] => 21134 [1] => 21135 [2] => 21137 [3] => 21138 [4] => 21144 [5] => 21147 [6] => 21149 ) — Prakash Kumar Guru, Oct 30 '18 at 09:24

score 4 · Answer 1 · answered Oct 30 '18 at 09:24

4

This case array_column() is very useful:

$resultArray = array_column($yourArray,'id');

If will give you the values of all the id's in a one-dimensional array.

See: http://php.net/manual/en/function.array-column.php

answered Oct 30 '18 at 09:24

KIKO Software

15,283
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score 1 · Answer 2 · answered Oct 30 '18 at 09:27

use array_column()

eg:

$array = Array
(
    [0] => Array
        (
            [id] => 21134
        )

    [1] => Array
        (
            [id] => 21135
        )

    [2] => Array
        (
            [id] => 21137
        )

    [3] => Array
        (
            [id] => 21138
        )

    [4] => Array
        (
            [id] => 21144
        )

    [5] => Array
        (
            [id] => 21147
        )

    [6] => Array
        (
            [id] => 21149
        )

    [7] => Array
        (
            [id] => 21150
        )

    [8] => Array
        (
            [id] => 21151
        )

    [9] => Array
        (
            [id] => 21152
        )

    [10] => Array
        (
            [id] => 21153
        )

)

use array_column() to convert it, like this,

$result = array_column($array,'id');

how does this differ from KIKO's answer? – treyBake Oct 30 '18 at 09:28 — treyBake, Oct 30 '18 at 09:28
@ThisGuyHasTwoThumbs: sorry i did't see that answers – Ramesh S Oct 30 '18 at 09:28 — Ramesh S, Oct 30 '18 at 09:28

score 1 · Answer 3 · answered Oct 30 '18 at 09:27

You can use array_map for multidimensional array into one-dimensional array

$oneDimensionalArray = array_map('current', $twoDimensionalArray);

you can also array_merge

$oneDimensionalArray = call_user_func_array('array_merge', $twoDimensionalArray);

How to convert multi-dimensional array into one-dimensional array

3 Answers3