(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.