Помогите, пожалуйста. Где-то затупил и не могу найти ошибку

$this->first_player->clear();
        $this->second_player->clear();
        $this->first_player->push($first_player_cards);
        $this->second_player->push($second_player_cards);
        $count = 0;
        while (
            !$this->first_player->isEmpty() && 
            !$this->second_player->isEmpty() && 
            $count < 100
        ) {
            ++$count;
            list($first, $second) = [$this->first_player->shift(), $this->second_player->shift()];
            var_dump($count);
            switch ($first <=> $second) {
                case (1) :
                    $this->first_player->push($first, $second);
                    break;
                case (-1) :
                    $this->second_player->push($second, $first);
                    break;
            }
        }
        if (($this->first_player->isEmpty() && $this->second_player->isEmpty()) || ($count >= 100)) {
            return 'Botva!';
        } elseif ($this->second_player->isEmpty()) {
            return "First player. Round: $count";
        } elseif ($this->first_player->isEmpty()) {
            return "Second player. Round: $count";
        }

<?php
 
namespace App;
 
use Ds\Deque;
 
class Drunkard
{
    private $first_player;
    private $second_player;
 
    public function __construct()
    {
        $this->first_player = new Deque();
        $this->second_player = new Deque();
    }
 
    public function run(array $first_player_cards, array $second_player_cards)
    {
        $this->first_player->clear();
        $this->second_player->clear();
        $this->first_player->push($first_player_cards);
        $this->second_player->push($second_player_cards);
        $count = 0;
        while (
            !$this->first_player->isEmpty() && 
            !$this->second_player->isEmpty() && 
            $count < 100
        ) {
            ++$count;
            list($first, $second) = [$this->first_player->shift(), $this->second_player->shift()];
            var_dump($count);
            switch ($first <=> $second) {
                case (1) :
                    $this->first_player->push($first, $second);
                    break;
                case (-1) :
                    $this->second_player->push($second, $first);
                    break;
            }
        }
        if (($this->first_player->isEmpty() && $this->second_player->isEmpty()) || ($count >= 100)) {
            return 'Botva!';
        } elseif ($this->second_player->isEmpty()) {
            return "First player. Round: $count";
        } elseif ($this->first_player->isEmpty()) {
            return "Second player. Round: $count";
        }
    }
 
}
$game = new Drunkard();
$result = $game->run([1, 2], [3, 2]);

$this->first_player->push(...$first_player_cards);
$this->second_player->push(...$second_player_cards);

$this->first_player = new Deque($first_player_cards);
$this->second_player = new Deque($second_player_cards);