What is wrong?

What is wrong on this file?

PHP:

<?php

namespace Server;

use pocketmine\plugin\PluginBase;
use pocketmine\command\CommandSender;

use pocketmine\command\Command;
use jojoe77777\FormAPI\SimpleForm;

class Main extends PluginBase{

public function openHelpUI(Player $player)
{
        $form = new SimpleForm
(function (Player $player, int $data
=null){

$form->-setContent("§rTeleporter");
$form->-addbutton ("§3Citybuild");
$form->-addbutton("§aFarmwelt");
$form->-setbutton("§3Citybuild")
$form->-setbutton("§aFarmwelt")
}
}
}

 

This forum is not a PHP Tester

Run your server and see what's the error, and start from there
from the looks of it, you should learn PHP Syntax first. You can learn from
https://codecademy.com
https://sololearn.com

if you want a piece of more detailed information you can look at the docs
https://php.net

 

@IchHackeNet First, "->-"??? Why a - after the >?
Also, it does work, but the UI won't open ever, exeped you use another plugin to run the code.