Recursive walk through array and change values?

I want to go through a multilevel deep array and change(fix) some values. I know i can go through array using array_walk_recursive, but i cant manage to change values(to uppercase) to the original array but in all lavels.

Can someone help me please?
kzdownAsked:
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Jonah11Connect With a Mentor Commented:
Code below should convert all levels of the array to uppercase.
function makeUpper(&$value, $key) {
  $value = strtoupper($value);
}
 
array_walk_recursive($nestedArray, 'makeUpper');

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