Php 连接数据库的Steam Web API

我正在尝试将Steam web API连接到我的数据库，并希望存储通过Steam登录的每个用户的姓名、个人资料图片等

当我看了一些关于它的视频后，我也试着做同样的事情，但是我犯了几个错误

我使用的文件：

Notice: Trying to get property 'response' of non-object in C:\xampp\htdocs\index.php on line 32

Notice: Trying to get property 'players' of non-object in C:\xampp\htdocs\index.php on line 32

Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\index.php on line 32

foreach ($content->response->players as $player)
{
    $sql_fetch_id = "SELECT * FROM users_steam WHERE steamid = $player->steamid";
    $query_id = mysqli_query($db, $sql_fetch_id);
    
    if(mysqli_num_rows($query_id) == 0) {
        $sql_steam = "INSERT INTO users_steam (name,steamid,avatar) VALUES ('$player->personaname','$player->steamid','$player->avatar')";
        mysqli_query($db, $sql_steam);
    }
}