array_change_key_case – Convert Array Keys to Uppercase or Lowercase in PHP
array_change_key_case() is a PHP function that transforms all string keys in an input array to either lower‑case or upper‑case based on the specified case constant, leaving numeric indexes unchanged, and returns the modified array or FALSE if the input is not an array.
array_change_key_case() returns an array with all string keys converted to either lower‑case or upper‑case.
Explanation: The function changes the case of keys in the $input array according to the $case parameter (either CASE_LOWER or CASE_UPPER). Numeric indexes are not affected.
Parameters
input – The array to be processed.
case – Optional. One of the constants CASE_UPPER or CASE_LOWER. Default is CASE_LOWER.
Return value
Returns the array with keys converted to the chosen case; if $input is not an array, the function returns FALSE.
Example
<?php
$input_array = array(
"FirSt" => 1,
"SecOnd" => 4
);
print_r(array_change_key_case($input_array, CASE_UPPER));
?>Output:
Array
(
[FIRST] => 1
[SECOND] => 4
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