Sort Multi Dimensional Array by its keys from another arrays values

bowser404 Published at Dev

bowser404

This is an issue I haven't come across before, and there doesn't appear to be a function for this.

I'm trying to sort the following multi dimensional array by its keys

Array (
    [hiphop] => Array (
        [0] => 2123
        [1] => 5683
        [2] => 2345
        [3] => 4567
    )
    [rnb] => Array (
        [0] => 2123
        [1] => 5683
        [2] => 2345
        [3] => 4567
    )
    [dubstep] => Array ( )
    [reggae] => Array ( )
    [trap] => Array ( )
)

From this arrays values

Array (
    [0] => hiphop
    [1] => dubstep
    [2] => reggae
    [3] => trap
    [4] => rnb
    [5] => rnb
)

Has anyone attempted this before or know a workaround?

An explanation would be great as I'm new to multi dimensional arrays

Many thanks in advance if you can help!

The final output would match the value organsiation from the non multi dimensional array like so

Array (
    [hiphop] => Array (
        [0] => 2123
        [1] => 5683
        [2] => 2345
        [3] => 4567
    )
    [dubstep] => Array ( )
    [reggae] => Array ( )
    [trap] => Array ( )
    [rnb] => Array (
        [0] => 2123
        [1] => 5683
        [2] => 2345
        [3] => 4567
    )
)

dognose

The easiest Way would be to "flip" the array definining the sorting - then grab the values matching the new keys in the other array:

$s = array ("hiphop","dubstep","reggae","trap","rnb");
$target = array_flip($s);

foreach($target AS $key => &$value){
  $value = $array_containing_unsorted_values[$key];
}

Note: does not work if the same value appears twice in the sorting array - but that never should happen, cause does not make sence for a sorting-definition.

Should be way faster than using array_search 2 times within each sorting comparission.

result:

Array
(
    [hiphop] => Array
        (
            [0] => 2123
            [1] => 5683
            [2] => 2345
            [3] => 4567
        )

    [dubstep] => Array
        (
        )

    [reggae] => Array
        (
        )

    [trap] => Array
        (
        )

    [rnb] => Array
        (
            [0] => 2123
            [1] => 5683
            [2] => 2345
            [3] => 4567
        )

)

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