How to set Armor of Player

when I do command /armor, get random of one player and set Armor automatically.
How can?

here is the code that I tried

PHP:

function setArmor(ArmorInventory $aie, $SA){
    $SA->getArmorInventory()->setHelmet(Item::get(310, 0, 1));
    $SA->getArmorInventory()->setChestplate(Item::get(311, 0, 1));
  }




  public function onCommand(CommandSender $sender, Command $command, string $label, array $args): bool {

    $command = $command->getName();
    $player = $sender->getPlayer();
    $name = $sender->getName ();

if($command == "armor"){

      $rp = $this->D["Players"][];

      $vrp = array_rand($rp,1);

setArmor("$vrp");

    }
    }

 

You can get a random player by getting all online players, and then using array_rand. Try this code (it was sort of rushed so...):

PHP:

public function setArmor(Player $player){
        $player->getArmorInventory()->setHelmet();
        $player->getArmorInventory()->setChestplate();
    }
  
    public function onCommand(CommandSender $sender, Command $command, string $label, array $args): bool {
        $cmd = $command->getName();
        if($cmd == "armor"){
            $players = $this->getServer()->getOnlinePlayers();
            $player = $players[array_rand($players)];
            $this->setArmor($player);
            return true;
        }
    }

I tried not using switch($command->getName()) for your convince