Starts an event.
string $name The event name:
string $category The event category:
StopwatchEvent The event
public function startEvent($name, $category) {
if (!isset($this->events[$name])) {
$this->events[$name] = new StopwatchEvent($this->origin ?: microtime(true) * 1000, $category);
}
return $this->events[$name]
->start();
}