나노초 단위 시간 측정을 위한 HRTime 익스텐션 예제 코드

hrtime.php

<?php
$c = new HRTime\StopWatch;

$c->start();
/* do some interesting stuff*/
$c->stop();
$elapsed0 = $c->getLastElapsedTime(HRTime\Unit::NANOSECOND);

/* do something else */

$c->start();
/* do some interesting stuff again */
$c->stop();
$elapsed1 = $c->getLastElapsedTime(HRTime\Unit::NANOSECOND);

$elapsed_total = $c->getElapsedTime(HRTime\Unit::NANOSECOND);

var_dump($elapsed0);
var_dump($elapsed1);
var_dump($elapsed_total);
?>