Array Functions
array_chunk
Array Functions
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` or `CASE_LOWER` (default)

### Return Values

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

### Errors/Exceptions

Throws `E_WARNING` if `input` 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.

Array Functions
array_chunk
Array Functions
PHP Manual