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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::getFrequency — Timer frequency in ticks per second
Returns the timer frequency in ticks per second. This value is constant after the system start on almost any operating system.
此函数没有参数。
Returns integer indicating the timer frequency.