class_exists

Function • Params and return types changed in PHP 8.0

Checks if the class 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

class_exists Function synopsis

class_exists(string $class, bool $autoload = true): bool

Parameters

$class

Typestring

The class name. The name is matched in a case-insensitive manner.

$autoload

OptionalTypeboolDefault valuetrue

Whether to autoload if not already loaded.

Return value

Typebool

Returns true if $class is a defined class, false otherwise.

Changes to the class_exists Function

PHP 8.0

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

class_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