Small PHP stopwatch for track how long your code executing

stopwatch.php

<?php

class Stopwatch
{
    public static function launch(bool $asMicrotime = true, int $precision = 4) : callable
    {
        $start = $asMicrotime ? microtime(true) : time();

        return function () use ($start, $asMicrotime, $precision) : string {
            $finish = $asMicrotime ? microtime(true) : time();

            return number_format($finish - $start, $precision, '.', '');
        };
    }
}

// Example of usage:

$executionTime = Stopwatch::launch();

// your code here ...
sleep(1);

echo 'Duration ' . $executionTime();