(PECL event >= 1.2.6-beta)
EventBase::loop — Dispatch pending events
$flags
    = ?): boolWait for events to become active, and run their callbacks.
     Do
     NOT
     destroy the
     EventBase
     object as long as resources of the associated
     Event
     objects are not released. Otherwise, it will lead to unpredictable
     results!
    
flags
    
      Optional flags. One of
      EventBase::LOOP_*
      constants. See
      EventBase constants
      .
     
   Returns true on success or false on failure.