PHP array_change_key_case function

array_change_key_case

(PHP 4 >= 4.2.0, PHP 5)

array_change_key_case -- Returns an array with all string keys lowercased or uppercasedDescriptionarray array_change_key_case ( array input [, int case] )

array_change_key_case() changes the
keys in the input array to
be all lowercase or uppercase. The change depends
on the last optional case
parameter. You can pass two constants there,
CASE_UPPER and
CASE_LOWER. The default is
CASE_LOWER. The function will leave
number indices as is.

Example 1. array_change_key_case() example

The above example will output:

Array
(
[FIRST] => 1
[SECOND] => 4
)

If an array has indices that will be the same once run through this
function (e.g. "keY" and "kEY"), the value that is later in the array
will override other indices.