Array: loop and modify and save?

[ChenXiu]

I have a json_decoded array which has a key named "location."
I want to duplicate this array, but with the location changed to lowercase (strtolower).
Does one accomplish this by looping through? Or by using Array_Map? Here is the array:

Array
(
    [data] => Array
        (
            [0] => Array
                (
                    [description] => Tools
                    [time] => 2021-07-27 GMT
                    [location] => WEST LONDON // strtolower on location
                )
            [1] => Array
                (
                    [description] => Foods
                    [time] => 2021-08-04 GMT
                    [location] => BIRMINGHAM // strtolower on location
                )
                
                etc. etc. etc......

Thank you.

Edited August 21, 2021 by ChenXiu

[Barand]

I'd just use a loop

foreach ($arr['data'] as &$a) {
    $a['location'] = ucwords(strtolower($a['location']));
}

array_map ain't going to play nice with nested arrays.