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# array_change_key_case

(PHP 4 >= 4.2.0, PHP 5)

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.

示範 1.array_change_key_case() example
`<?php $input_array = array("FirSt" => 1, "SecOnd" => 4); print_r(array_change_key_case($input_array, CASE_UPPER)); ?>`
The printout of the above program will be:
    Array
    (
        [FIRST] => 1
        [SECOND] => 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.

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