(PHP 4 >= 4.2.0, PHP 5, PHP 7)
Changes the case of all keys in an array
array array_change_key_case ( array $array [, int $case = CASE_LOWER ] )
Returns an array with all keys from array lowercased or uppercased. Numbered indices are left as is.
Parameters:
array
The array to work on
case
Either CASE_UPPER or CASE_LOWER (default)
Returns:
Returns an array with its keys lower or uppercased, or FALSE if array is not an array.
Exception:
Throws E_WARNING if array is not an array.
Notes:
If an array has indices that will be the same once run through this function (e.g. "keY" and "kEY"), the value that is later in the array will override other indices.
Examples:
array_change_key_case() example
1 2 3 4 | <?php$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
)
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