call_user_func

Function • Params and return types changed in PHP 8.0

Call the callback given by the first parameter.

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

call_user_func Function synopsis

call_user_func(callable $callback, mixed ...$args): mixed

Parameters

$callback

Typecallable

The callable to be called.

$args

Variadic, OptionalTypemixed

Zero or more parameters to be passed to the callback.

Return value

Typemixed

Returns the return value of the callback.

Changes to the call_user_func Function

PHP 8.0

  • Return type added: mixed
  • Parameter name of parameter #1 changed: $function_name to $callback
  • Parameter type added for parameter #1 ($callback): callable
  • Parameter name of parameter #2 changed: $parameters to $args
  • Parameter type added for parameter #2 ($args): mixed
- call_user_func($function_name, ...$parameters)
+ call_user_func(callable $callback, mixed ...$args): mixed

call_user_func 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