PHP: Change Array Key Case – All Array Keys to Lowercase or Uppercase

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While you can easily fabricate your own functions to do this element by element, you can simply resort to the php function array_change_key_case() to do it for you:

$new_array = array_change_key_case($old_array, CASE_UPPER);

Changes all the keys in $old_array to upper case and

$new_array = array_change_key_case($old_array, CASE_LOWER);

Changes all the keys in $old_array to lower case.