(PECL ev >= 0.2.0)
EvLoop::io — Create EvIo watcher object associated with the current event loop instance
$fd
   
   , 
    int
     $events
   
   , 
    callable
     $callback
   
   [, 
    mixed
     $data
     = NULL
   
   [, 
    int
     $priority
     = 0
   
  ]] )Create EvIo watcher object associated with the current event loop instance.
All parameters have the same meaning as for EvIo::__construct()
Returns EvIo object on success.