Combine inner arrays into one

Question

I have this array of userids. I want to combine the child userid arrays into one array within the parent arrays.

[0] => Array
    (
        [0] => Array
            (
                [userid] => 1610
            )

        [1] => Array
            (
                [userid] => 1614
            )

        [2] => Array
            (
                [userid] => 1616
            )

    )

[1] => Array
    (
        [0] => Array
            (
                [userid] => 1610
            )

        [1] => Array
            (
                [userid] => 1614
            )

        [2] => Array
            (
                [userid] => 1616
            )

        [3] => Array
            (
                [userid] => 1618
            )

    )

My desired result would look like...

[0] => Array
    (
        [userids] => Array
            (
                [0] => 1610
                [1] => 1614
                [2] => 1616
            )
)

[1] => Array
    (
        [userids] => Array
            (
                [0] => 1610
                [1] => 1614
                [2] => 1616
                [3] => 1618
            )
)

Possible duplicate of [How to Flatten a Multidimensional Array?](https://stackoverflow.com/questions/1319903/how-to-flatten-a-multidimensional-array) — Sunny Patel, Jun 12 '19 at 19:20

score 0 · Accepted Answer · answered Jun 12 '19 at 19:28

0

Loop the array and use array_column to flatten the subarrays.

foreach($arr as $sub){
    $res[][key($sub[0]) . "s"] = array_column($sub, 'userid');
}

var_dump($res);

https://3v4l.org/A68VA

answered Jun 12 '19 at 19:28

Andreas

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Perfect! Thank you! – stevenpepe Jun 12 '19 at 19:32

Combine inner arrays into one

1 Answers1