interface_exists

Function • Params and return types changed in PHP 8.0

Checks if the interface has been defined.

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

interface_exists Function synopsis

interface_exists(string $interface, bool $autoload = true): bool

Parameters

$interface

Typestring

The interface name

$autoload

OptionalTypeboolDefault valuetrue

Whether to autoload if not already loaded.

Return value

Typebool

Returns true if the interface given by $interface has been defined, false otherwise.

Changes to the interface_exists Function

PHP 8.0

  • Return type added: bool
  • Parameter name of parameter #1 changed: $classname to $interface
  • Parameter type added for parameter #1 ($interface): string
  • Parameter type added for parameter #2 ($autoload): bool
  • Parameter default value added for position #2 ($autoload): true
- interface_exists($classname, $autoload)
+ interface_exists(string $interface, bool $autoload = true): bool

interface_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