(PECL event >= 1.2.6-beta)
Event::signal — Constructs signal event object
public static Event::signal ( EventBase $base , int $signum , callable $cb [, mixed $arg ] ) : Event
Constructs signal event object. This is a straightforward method to create a signal event. Note, the generic Event::__construct() method can contruct signal event objects too.
base The associated event base object.
signum The signal number.
cb The signal event callback. See Event callbacks .
arg Custom data. If specified, it will be passed to the callback when event triggers.
Returns Event object on success. Otherwise false.
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https://www.php.net/manual/en/event.signal.php