(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
array_change_key_case — Changes the case of all keys in an array
Returns an array with all keys from array lowercased
or uppercased. Numbered indices are left as is.
Returns an array with its keys lower or uppercased.
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
)
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.