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
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, or null if array is not an array.
Exceptions and Errors
Throws E_WARNING if array is not an array.
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.