(PECL libevent >= 0.0.1)
event_add — Add an event to the set of monitored events
bool event_add ( resource $event [, int $timeout = -1 ] )
event_add() schedules the execution of the event when the event specified in event_set() occurs or in at least the time specified by the timeout argument. If timeout was not specified, not timeout is set. The event must be already initalized by event_set() and event_base_set() functions. If the event already has a timeout set, it is replaced by the new one.
event
Valid event resource.
timeout
Optional timeout (in microseconds).
event_add() returns TRUE on success or FALSE on error.
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https://secure.php.net/manual/en/function.event-add.php