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(PECL libevent >= 0.0.1)
Event::add — Makes event pending
$timeout 
  ] )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