(PECL ev >= 0.2.0)
EvLoop::periodic — Creates EvPeriodic watcher object associated with the current event loop instance
$offset
   
   , 
    double
     $interval
   
   , 
    callable
     $callback
   
   [, 
    mixed
     $data
     = NULL
   
   [, 
    int
     $priority
     = 0
   
  ]] )Creates EvPeriodic watcher object associated with the current event loop instance
All parameters have the same maening as for EvPeriodic::__construct()
Returns EvPeriodic object on success.