= 0.4.3)簡介類摘要class HRTime\Unit {/* Constants */const int SECOND = 0;const int MILLISECOND = 1;const int MICROSECON">
(PECL hrtime >= 0.4.3)
HRTime\Unit::SECOND
HRTime\Unit::MILLISECOND
HRTime\Unit::MICROSECOND
HRTime\Unit::NANOSECOND