api_usage.php

<?php

use pocketmine\event\player\PlayerJoinEvent;
use bossbarapi\bossbar\BossBar;

class api_usage {
    function onJoin(PlayerJoinEvent $ev){
        $player = $ev->getPlayer();
        $bossBar = BossBar::create($player);
        $bossBar->setTitle("Sample");
        $bossBar->setPercentage(0.2);
        $bossBar->show();
    }
}