array_change_key_case

Function • Params and return types changed in PHP 8.0

Changes the case of all keys in an array.

PHP 5
PHP 7
PHP 8.0
Improved
PHP 8.1
PHP 8.2-8.3
PHP 8.4
PHP 8.5
PHP 8.6

array_change_key_case Function synopsis

array_change_key_case(array $array, int $case = CASE_LOWER): array

Parameters

$array

Typearray

The array to work on

$case

OptionalTypeintDefault valueCASE_LOWER

Either CASE_UPPER or CASE_LOWER (default)

$case accepts one of the following constant values:

Return value

Typearray

Returns an array with its keys lower or uppercased.

Changes to the array_change_key_case Function

PHP 8.0

  • Return type added: array
  • Parameter name of parameter #1 changed: $input to $array
  • Parameter type added for parameter #1 ($array): array
  • Parameter type added for parameter #2 ($case): int
  • Parameter default value added for position #2 ($case): CASE_LOWER
- array_change_key_case($input, $case)
+ array_change_key_case(array $array, int $case = CASE_LOWER): array

array_change_key_case Function Availability

PHP VersionAvailability
PHP 8.6Upcoming Release Yes
PHP 8.5Supported (Latest) Yes
PHP 8.4Supported Yes
PHP 8.3Security-Fixes Only Yes
PHP 8.2Security-Fixes Only Yes
PHP 8.1Unsupported Yes
PHP 8.0Unsupported Yes
PHP 7.4Unsupported Yes
PHP 7.3Unsupported Yes
PHP 7.2Unsupported Yes
PHP 7.1Unsupported Yes
PHP 7.0Unsupported Yes
PHP 5.6Unsupported Yes
PHP 5.5Unsupported Yes
PHP 5.4Unsupported Yes
PHP 5.3Unsupported Yes