Anybody walk through to help me complete the wings particles plugin

PHP:

<?php

/*
 *
 * __  __ _                               
 *|  \/  (_)              /\             
 *| \  / |_ _ __   ___   /  \   _ __ ___ 
 *| |\/| | | '_ \ / _ \ / /\ \ | '__/ _ \
 *| |  | | | | | |  __// ____ \| | | (_) |
 *|_|  |_|_|_| |_|\___/_/    \_\_|  \___/                     
 *
 *
 *
*/

namespace Wing;

use pocketmine\event\Listener;

use pocketmine\plugin\PluginBase;

use pocketmine\event\player\PlayerChatEvent;
use pocketmine\event\player\PlayerMoveEvent;
use pocketmine\event\player\PlayerQuitEvent;
use pocketmine\event\player\PlayerKickEvent;
use pocketmine\event\player\PlayerDeathEvent;
use pocketmine\event\player\PlayerInteractEvent;
use pocketmine\event\player\PlayerDropItemEvent;
use pocketmine\event\block\BlockBreakEvent;


use pocketmine\event\entity\EntityDamageEvent;
use pocketmine\event\entity\ProjectileLaunchEvent;
use pocketmine\event\entity\ProjectileHitEvent;
use pocketmine\event\entity\EntityDamageByEntityEvent;
use pocketmine\event\block\SignChangeEvent;

use pocketmine\level\Position;
use pocketmine\level\particle\FlameParticle;
use pocketmine\utils\Config;
use pocketmine\item\Item;
use pocketmine\block\Block;

use pocketmine\entity\Arrow;
use pocketmine\entity\Entity;


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


use pocketmine\nbt\tag\IntTag;
use pocketmine\nbt\tag\CompoundTag;

use pocketmine\math\Vector2;
use pocketmine\math\Vector3;

use pocketmine\Player;
use pocketmine\IPlayer;



class Main extends PluginBase implements Listener {

    private $db;
    public $player = "";

    public function player(Player $player)
    {
        return $player;
    }

    public function onCommand(CommandSender $sender, Command $command, $label, array $args)
    {
        $player = $this->player($sender);
        $map = [];
        $lines = explode("\n", rtrim("X       X
 XX   XX
  XXXXX
    X"));

        $height = count($lines);
        foreach($lines as $lineNumber => $line){
            $len = strlen($line);
            for($i = 0; $i < $len; ++$i){
                if($line{$i} === "X"){
                    $map[] = new Vector2($i, $height - $lineNumber - 1);
                }
            }
        }
        $scale = 0.2;
        $particle = new FlameParticle(new Vector3);
        $yaw = $player->yaw / 180 * M_PI;
        $xFactor = -sin($yaw) * $scale;
        $zFactor = cos($yaw) * $scale;
        foreach($map as $vector){
            $particle->y = $vector->y;
            $particle->x = $xFactor * $vector->x;
            $particle->z = $zFactor * $vector->x;
            $player->getLevel()->addParticle($particle);
        }


    }

}

 

We don't know what error you're getting.

 

Where is the command you need to enter to make the code work?