join

Function • Params and return types changed in PHP 8.0

Alias of implode.

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

join Function synopsis

join(array|string $separator, ?array $array = null): string

Parameters

$separator

Typearray|string

$array

OptionalType?arrayDefault valuenull

Return value

Typestring

Changes to the join Function

PHP 8.0

  • Return type added: string
  • Parameter name of parameter #1 changed: $glue to $separator
  • Parameter type added for parameter #1 ($separator): array|string
  • Parameter name of parameter #2 changed: $pieces to $array
  • Parameter type added for parameter #2 ($array): ?array
  • Parameter default value added for position #2 ($array): null
- join($glue, $pieces)
+ join(array|string $separator, ?array $array = null): string

join 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