(PECL ev >= 0.2.0)
EvPeriodic::set — Configures the watcher
$offset
   
   , 
    double
     $interval
   
   )(Re-)Configures EvPeriodic watcher
offset
    The same meaning as for EvPeriodic::__construct() . See Periodic watcher operation modes
interval
    The same meaning as for EvPeriodic::__construct() . See Periodic watcher operation modes
No value is returned.