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(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