我有個問題我想回顯“點”列的值我嘗試過，但沒有用：$stmt = $mysqli->prepare("SELECT points FROM member_profile WHERE user_id = '$firstName'");$stmt->execute();$array = [];foreach ($stmt->get_result() as $row){    $array[] = $row['points'];}print_r($array);這是我當前的代碼：<?phpheader('Content-Type: text/html; charset=Windows-1250');    session_start();$firstName = $_SESSION['firstname'];$servername = "db.xxxx.gsp-europe.net";$username = "xxxxxxxxxxxxx";$password = "xxxxxxxxxxxxxx";$dbname = "xxxxxxxx";/// Create connection$conn = new mysqli($servername, $username, $password, $dbname);// Check connection   if ($conn->connect_error) {    die("Connection failed: " . $conn->connect_error);} // check if the user exist$check = "SELECT * FROM `member_profile` WHERE user_id = '$firstName'";$result = mysqli_query($conn,$check) or die(mysqli_error($conn));        $rows = mysqli_num_rows($result);        //if exist increse points with 1        if($rows>=1){$sql = "UPDATE `member_profile` SET points = points + 1 WHERE user_id = '$firstName'";   if ($conn->query($sql) === TRUE) {    echo "Thingz created successfully";} else {    echo "Error doing sum thingz: " . $conn->error;}        }        //if don't exist create user with points 0        if($rows==0)        {            $query = "INSERT into `member_profile` (user_id, points) VALUES ( '$firstName' ,'0')";            $result = mysqli_query($conn,$query)or die(mysqli_error($conn));$conn->close();        }?>簡而言之，我需要什么：在文件的末尾，將是一個“回聲”，它將顯示帶有標識符“user_id”的“點”列的當前值。就這樣