Server Shutdown

Question:
How would I be able to detect when a server is shutting down, and transfer all players to a different server?

 

PHP:

if($this->getServer()->isRunning() == false){

 

PHP:

    public function onDisable(){
        foreach($this->getServer()->getOnlinePlayers() as $p){
            $p->transfer("ip", "port", "message?");
        }
    }

will this work to transfer all players?

 

PHP:

  public function onDisable(){
        foreach($this->getServer()->getOnlinePlayers() as $p){
        if($this->getServer()->isRunning() == false){
            $p->transfer($ip, $port, $message);
            }
        }
    }