<?php
 namespace chanel;

   use pocketmine\plugin\PluginBase;
   use pocketmine\event\Listener;
   use pocketmine\event\player\PlayerChatEvent;
   use pocketmine\command\Command;
   use pocketmine\command\CommandSender;

     class chanel extends PluginBase implements Listener{

        public function onCommand(CommandSender $sender, Command $cmd, $label, array $args){
          if($cmd == 'join'){
            if(isset($args[0])) return($sender->sendMessage("§cВведите цифры от 1 до 2!"));
            switch ($args[0]){
              case 1:
              case 2:
              default: $sender->sendMessage("§cВведите цифры от 1 до 2!"); break;
}
}
}

        public function onEnable(){

          $this->getServer()->getPluginManager()->registerEvents($this, $this);

 }
}