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# array_change_key_case

(PHP 4 >= 4.2.0)

array_change_key_case -- Returns an array with all string keys lowercased or uppercased

## Description

array 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

    $input_array = array("FirSt" => 1, "SecOnd" => 4);
    print_r(array_change_key_case($input_array, CASE_UPPER));

The printout of the above program will be:

    Array
    (
        [FIRST] => 1
        [SECOND] => 2
    )

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