key_exists

Function • Params and return types changed in PHP 8.0

Alias of array_key_exists.

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

key_exists Function synopsis

key_exists($key, array $array): bool

Parameters

$key
$array

Typearray

Return value

Typebool

Changes to the key_exists Function

PHP 8.0

  • Return type added: bool
  • Parameter name of parameter #2 changed: $search to $array
  • Parameter type added for parameter #2 ($array): array
- key_exists($key, $search)
+ key_exists($key, array $array): bool

key_exists 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