use Symfony\Component\Stopwatch\Stopwatch;

$stopwatch = new Stopwatch();

// optionally group events into sections (e.g. phases of the execution)
$stopwatch->openSection();

// starts event named 'eventName'
$stopwatch->start('eventName');

// ... run your code here

// optionally, start a new "lap" time
$stopwatch->lap('foo');

// ... run your code here

$event = $stopwatch->stop('eventName');

$stopwatch->stopSection('phase_1');