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(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.

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
)

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.