(PECL ev >= 0.2.0)
EvLoop::stat — Creates EvStat watcher object associated with the current event loop instance
$path
   ,$interval
   ,$callback
   ,$data
     = null
   ,$priority
     = 0
   Creates EvStat watcher object associated with the current event loop instance
All parameters have the same meaning as for EvSignal::__construct()
Returns EvStat object on success
