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array_change_key_case

PHP function Edit on GitHub ✎

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

Changes 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.

Examples

array_change_key_case() example

php

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

The above example will output:

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.

Source: reference/array/functions/array-change-key-case.xml · from the official PHP manual (php/doc-en)