(PECL event >= 1.2.6-beta)
Event::add — Makes event pending
public Event::add ([ float $timeout ] ) : bool
Marks event pending. Non-pending event will never occur, and the event callback will never be called. In conjuction with Event::del() an event could be re-scheduled by user at any time.
If Event::add() is called on an already pending event, libevent will leave it pending and re-schedule it with the given timeout(if specified). If in this case timeout is not specified, Event::add() has no effect.
timeout Timeout in seconds.
Returns true on success. Otherwise false
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https://www.php.net/manual/en/event.add.php