array_merge

Function • Params and return types changed in PHP 8.0

Merge one or more arrays.

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_merge Function synopsis

array_merge(array ...$arrays): array

Parameters

$arrays

Variadic, OptionalTypearray

Variable list of arrays to merge.

Return value

Typearray

Returns the resulting array. If called without any arguments, returns an empty array.

Changes to the array_merge Function

PHP 8.0

  • Return type added: array
  • Parameter type added for parameter #1 ($arrays): array
- array_merge(...$arrays)
+ array_merge(array ...$arrays): array

PHP 7.4

  • Parameter count changed: 2 to 1
  • Optional parameter removed - #2: $arrays
- array_merge($arr1, ...$arrays)
+ array_merge(...$arrays)

array_merge 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