test.php

<?php

declare(strict_types=1);

namespace a;

use pocketmine\command\Command;
use pocketmine\command\CommandExecutor;
use pocketmine\command\CommandSender;

class test implements CommandExecutor
{
    
    public function onCommand(CommandSender $sender, Command $command, string $label, array $args): bool
    {
        switch ($label) {//まずは最初の部分( />slot< abc )で分岐
            case "slot":
                switch ($args[0]) {//次の部分で( /slot >abc< )で分岐
                    case "syouyu":
                        //適当な処理
                        return true;
                    case "yurisi":
                        //適当な処理
                        return true;
                }
        }
        return false;
    }
    
}