What is the array_change_key_case method in PHP?
The array_change_key_case method can change the case of all keys of the array to either upper or lower case keys. The numeric keys are left unchanged.
Syntax
array_change_key_case(array $array, int $case = CASE_LOWER): array
Arguments
-
array: The array in which the case of the keys is to be changed. -
case: Denotes the resulting case of array keys. The possible values can be:CASE_UPPER: Equivalentintvalue is 1.CASE_LOWER: Equivalentintvalue is 0.
caseis an optional value. The default value isCASE_LOWER.
Example
<?php$arr = array(10, 20, "onE" => 1, "TwO" => 2, "THrEe" => 3);echo "Converting to Uppercase\n";print_r(array_change_key_case($arr, CASE_UPPER));echo "Converting to Lowercase\n";print_r(array_change_key_case($arr, CASE_LOWER));?>
In the code above, we created an array and converted all the array’s keys to uppercase, and then tried to convert to lowercase using the array_change_key_case method.
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