Timer.php
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Timer.php
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	<?php declare(strict_types=1);
	/*
	* This file is part of phpunit/php-timer.
	*
	* (c) Sebastian Bergmann <sebastian@phpunit.de>
	*
	* 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<float>
	*/
	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));
	}
	}