pocketmine\form\Formを無名クラスで使う

form.php

<?php

declare(strict_types=1);

namespace Author\PluginName;

use pocketmine\command\Command;
use pocketmine\command\CommandSender;
use pocketmine\form\Form;
use pocketmine\Player;
use pocketmine\plugin\PluginBase;
use pocketmine\utils\TextFormat;

class Main extends PluginBase
{
    
    public function onCommand(CommandSender $sender, Command $command, string $label, array $args): bool
    {
        if (!$sender instanceof Player) {
            $sender->sendMessage(TextFormat::RED . "プレイヤーから実行してください！");
            return true;
        }
        $form = new class implements Form {
            public function handleResponse(Player $player, $data): void
            {
                // TODO: Implement handleResponse() method.
            }
            
            public function jsonSerialize()
            {
                // TODO: Implement jsonSerialize() method.
            }
        };
        $sender->sendForm($form);
        return true;
    }
    
}