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(PECL event >= 1.2.6-beta)
EventBase::getTimeOfDayCached — Returns the current event base time
On success returns the current time(as returned by gettimeofday() ), looking at the cached value in base if possible, and calling gettimeofday() or clock_gettime() as appropriate if there is no cached time.
此函数没有参数。
   Returns the current
   event base
   time. On failure returns  NULL .