array_change_key_case

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

    array_change_key_case — 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

    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.

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