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