(PECL libevent >= 0.0.1)
event_set — Prepare an event
   Prepares the event to be used in event_add(). The event
   is prepared to call the function specified by the callback 
   on the events specified in parameter events, which
   is a set of the following flags: EV_TIMEOUT, 
   EV_SIGNAL, EV_READ, 
   EV_WRITE and EV_PERSIST.
  
   If EV_SIGNAL bit is set in parameter events,
   the fd is interpreted as signal number.
  
After initializing the event, use event_base_set() to associate the event with its event base.
   In case of matching event, these three arguments are passed to the
   callback function: 
   
fdSignal number or resource indicating the stream.
events
       A flag indicating the event. Consists of the following flags:
       EV_TIMEOUT, EV_SIGNAL, 
       EV_READ, EV_WRITE
       and EV_PERSIST.
      
arg
       Optional parameter, previously passed to event_set()
       as arg.
      
eventValid event resource.
fdValid PHP stream resource. The stream must be castable to file descriptor, so you most likely won't be able to use any of filtered streams.
events
       A set of flags indicating the desired event, can be
       EV_READ and/or EV_WRITE.
       The additional flag EV_PERSIST makes the event
       to persist until event_del() is called, otherwise
       the callback is invoked only once. 
      
callbackCallback function to be called when the matching event occurs.
argOptional callback parameter.
   event_set() returns TRUE on success or FALSE on error.
  
| Version | Description | 
|---|---|
| 0.0.4 | EV_SIGNALsupport was added. |