PHP Manual
array_change_key_case (PHP 4 >= 4.2.0, PHP 5)
array_change_key_case -- Changes all keys in an array
Description 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.
Parameters
input
The array to work on
case
Either CASE_UPPER CASE_LOWER
Return Values
Returns an array with its keys lower or uppercased, or false if
input is not an array.
Errors/Exceptions
Throws E_WARNING input is
not an array.
Examples
Example 1. array_change_key_case() example
<?php = 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.
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