Execute command on event

How would I execute a command (from console) on the end of a duel in minifixio's 1vs1? Where would I put the code aswell, like which file? Main?.
I want the map to be reset so...

PHP:

public function onEndOfDuelEvent(){
    //code for executing the command, please tell me what it is?

 

Try this

PHP:

public function onEndOfDuelEvent(){
$this->getServer()->dispatchCommand(new ConsoleCommandSender(), "say this is the command to be ran");
}


 

PHP:

public function onEndOfDuelEvent(){
    Server::dispatchCommand(new ConsoleCommandSender(), "stop");
}