array_change_key_case

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

array_change_key_caseChanges the case of all keys in an array


Description

array_change_key_case ( array $array [, int $case = CASE_LOWER ] ) : array

Returns an array with all keys from array lowercased or uppercased. Numbered indices are left as is.


Parameters

array
The array to work on
case
Either CASE_UPPER or CASE_LOWER (default)


Return Values

Returns an array with its keys lower or uppercased, or FALSE if array is not an array.


Errors/Exceptions

Throws E_WARNING if array is not an array.


Examples

Example #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 above example will output:


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

Notes

Note:

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.