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# phpunit/php-timer [](https://packagist.org/packages/phpunit/php-timer) [](https://github.com/sebastianbergmann/php-timer/actions) [](https://codecov.io/gh/sebastianbergmann/php-timer) Utility class for timing things, factored out of PHPUnit into a stand-alone component. ## Installation You can add this library as a local, per-project dependency to your project using [Composer](https://getcomposer.org/): ``` composer require phpunit/php-timer ``` If you only need this library during development, for instance to run your project's test suite, then you should add it as a development-time dependency: ``` composer require --dev phpunit/php-timer ``` ## Usage ### Basic Timing ```php require __DIR__ . '/vendor/autoload.php'; use SebastianBergmann\Timer\Timer; $timer = new Timer; $timer->start(); foreach (\range(0, 100000) as $i) { // ... } $duration = $timer->stop(); var_dump(get_class($duration)); var_dump($duration->asString()); var_dump($duration->asSeconds()); var_dump($duration->asMilliseconds()); var_dump($duration->asMicroseconds()); var_dump($duration->asNanoseconds()); ``` The code above yields the output below: ``` string(32) "SebastianBergmann\Timer\Duration" string(9) "00:00.002" float(0.002851062) float(2.851062) float(2851.062) int(2851062) ``` ### Resource Consumption #### Explicit duration ```php require __DIR__ . '/vendor/autoload.php'; use SebastianBergmann\Timer\ResourceUsageFormatter; use SebastianBergmann\Timer\Timer; $timer = new Timer; $timer->start(); foreach (\range(0, 100000) as $i) { // ... } print (new ResourceUsageFormatter)->resourceUsage($timer->stop()); ``` The code above yields the output below: ``` Time: 00:00.002, Memory: 6.00 MB ``` #### Duration since PHP Startup (using unreliable `$_SERVER['REQUEST_TIME_FLOAT']`) ```php require __DIR__ . '/vendor/autoload.php'; use SebastianBergmann\Timer\ResourceUsageFormatter; foreach (\range(0, 100000) as $i) { // ... } print (new ResourceUsageFormatter)->resourceUsageSinceStartOfRequest(); ``` The code above yields the output below: ``` Time: 00:00.002, Memory: 6.00 MB ```