array_diff_key

Function • Params and return types changed in PHP 8.0

Computes the difference of arrays using keys for comparison.

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

array_diff_key Function synopsis

array_diff_key(array $array, array ...$arrays): array

Parameters

$array

Typearray

The array to compare from

$arrays

Variadic, OptionalTypearray

Arrays to compare against

Return value

Typearray

Returns an array containing all the entries from $array whose keys are absent from all of the other arrays.

Changes to the array_diff_key Function

PHP 8.0

  • Return type added: array
  • Parameter name of parameter #1 changed: $arr1 to $array
  • Parameter type added for parameter #1 ($array): array
  • Parameter type added for parameter #2 ($arrays): array
- array_diff_key($arr1, ...$arrays)
+ array_diff_key(array $array, array ...$arrays): array

array_diff_key Function Availability

PHP VersionAvailability
PHP 8.6Upcoming Release Yes
PHP 8.5Supported (Latest) Yes
PHP 8.4Supported Yes
PHP 8.3Supported Yes
PHP 8.2Security-Fixes Only Yes
PHP 8.1Security-Fixes Only 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