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このドキュメントでは、 php中国語ネットマニュアル リリース
(PECL hrtime >= 0.4.3)
HRTime\PerformanceCounter::start — Start time measurement
Starts the time measurement. It has no effect if the measurement was already started. The measurement will be continued if it was previously stopped.
此函数没有参数。
Returns void.