* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace SebastianBergmann\Timer; use function array_pop; use function hrtime; final class Timer { /** * @psalm-var list */ private $startTimes = []; public function start(): void { $this->startTimes[] = (float) hrtime(true); } /** * @throws NoActiveTimerException */ public function stop(): Duration { if (empty($this->startTimes)) { throw new NoActiveTimerException( 'Timer::start() has to be called before Timer::stop()' ); } return Duration::fromNanoseconds((float) hrtime(true) - array_pop($this->startTimes)); } }