Given these interfaces and classes:

Given these interfaces and classes:

interface Logger { public function log(string $msg); }
interface Notifier { public function notify(string $msg); }
class System implements Logger, Notifier {
  private array $logs = [];
  public function log(string $msg) { $this->logs[] = $msg; }
  public function notify(string $msg) { echo "Notify: $msg\n"; }
  public function getLogs(): array { return $this->logs; }
}
$sys = new System();
$sys->log('Start');
$sys->notify('Alert');
$sys->log('End');
print_r($sys->getLogs());

What is the output of this code?