73 lines
1.8 KiB
PHP
73 lines
1.8 KiB
PHP
<?php
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// Stopwatch.php
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// Created: 2021-04-26
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// Updated: 2022-02-16
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namespace Index\Performance;
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/**
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* Provides a means to measure elapsed time at a high resolution.
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*/
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class Stopwatch {
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private int|float $start = -1;
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private int|float $elapsed = 0;
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private int|float $frequency;
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public function __construct() {
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$this->frequency = PerformanceCounter::getFrequency();
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}
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public function start(): void {
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if($this->start < 0)
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$this->start = PerformanceCounter::getTicks();
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}
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public function stop(): void {
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if($this->start < 0)
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return;
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$this->elapsed += PerformanceCounter::getTicksSince($this->start);
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$this->start = -1;
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}
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/**
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* Checks whether the Stopwatch is currently running.
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*
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* @return bool true if the Stopwatch is running, false if not.
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*/
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public function isRunning(): bool {
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return $this->start >= 0;
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}
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/**
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* Gets the number of ticks that have elapsed.
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*
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* @return int|float Number of ticks.
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*/
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public function getElapsedTicks(): int|float {
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$elapsed = $this->elapsed;
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if($this->start >= 0)
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$elapsed += PerformanceCounter::getTicksSince($this->start);
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return $elapsed;
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}
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/**
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* Gets the number of elapsed milliseconds.
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*
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* @return float Number of elapsed milliseconds.
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*/
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public function getElapsedTime(): float {
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return $this->getElapsedTicks() / $this->frequency;
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}
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/**
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* Creates a new Stopwatch instance and starts measuring time.
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*
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* @return Stopwatch Newly created running Stopwatch.
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*/
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public static function startNew(): Stopwatch {
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$sw = new Stopwatch;
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$sw->start();
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return $sw;
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}
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}
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