PHP Function array_change_key_case()

Syntax

array array_change_key_case ( array $input [, int $case] )

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

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

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

Try out following example:

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

This will produce following result:

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