Start time measurement

# HRTime\StopWatch::start

(PECL hrtime >= 0.4.3)

HRTime\StopWatch::start — Start time measurement

### 说明

public function HRTime\StopWatch::start(): void

Starts the time measurement. It has no effect if the measurement was already started. The measurement will be continued if it was previously stopped.

### 参数

此函数没有参数。

### 返回值

Returns void.

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