Give the player the specified items when he executes the command

Hello Guys, i have a question, how can i make the $sender get the items when he executes a command? thanks

PHP:

case 'hello':
                   //what do i need to put here?          
                                break;

$sender->getInventory()->addItem();

PHP:

use pocketmine\Player;
use pocketmine\item\Item;

if($sender instanceof Player) {
    $sender->getInventory()->addItem(Item::get((ID), (Meta), (Amount));
}


wow, thanks a lot bro