pcntl_signal

Function • Params and return types changed in PHP 8.0

Installs a signal handler.

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

pcntl_signal Function synopsis

pcntl_signal(
    int $signal,
    $handler,
    bool $restart_syscalls = true
  ): bool

Parameters

$signal

Typeint

The signal number.

$handler

The signal handler. This may be either a callable, which will be invoked to handle the signal, or either of the two global constants SIG_IGN or SIG_DFL, which will ignore the signal or restore the default signal handler respectively.

$restart_syscalls

OptionalTypeboolDefault valuetrue

Specifies whether system call restarting should be used when this signal arrives.

Return value

Typebool

Returns true on success, false on failure

Changes to the pcntl_signal Function

PHP 8.0

  • Return type added: bool
  • Parameter name of parameter #1 changed: $signo to $signal
  • Parameter type added for parameter #1 ($signal): int
  • Parameter type added for parameter #3 ($restart_syscalls): bool
  • Parameter default value added for position #3 ($restart_syscalls): true
  pcntl_signal(
-     $signo,
+     int $signal,
      $handler,
-     $restart_syscalls
+     bool $restart_syscalls = true
-   )
+   ): bool

pcntl_signal 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