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PHP Manual [array_change_key_case]

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PHP Manual || Array Functions

(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_arrayCASE_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.



PHP Manual || Array Functions