Как запустить несколько процессов в ReactPHP?

        $loop = React\EventLoop\Factory::create(); 
         
        $url =  'https://www.kreuzwort-raetsel.net/j'; 
        $first = new Process('sleep 1; $url'); 
        $first->start($loop); 
 
        $url = 'https://www.kreuzwort-raetsel.net/c'; 
        $second = new Process('sleep 2; $url'); 
        $second->start($loop); 
         
 $timer = $loop->addPeriodicTimer(1, function () use (&$url,&$mes,&$lastPage, &$count, &$timer, $loop){ 
 ......code 
 } 
$loop->run();