PHP编写的语句不´；不能在Web服务器上工作

您好，我的网站上的以下代码有问题：

<?php
session_start();
include '../databaseConnector.php';

$uid = mysqli_real_escape_string($connector, $_POST['uid']);
$pwd = mysqli_real_escape_string($connector, $_POST['pwd']);


$stmt = $connector->prepare("SELECT * FROM nutzer WHERE uid=?");
$stmt->bind_param("s", $username);

$username = $uid;
$stmt->execute();

$result = $stmt->get_result();

$row = mysqli_fetch_assoc($result);
$hash_pw = $row['pwd'];
$dehash = password_verify($pwd, $hash_pw);

if($dehash == 0)
{
    header("Location: ../loginscreen.php?error=pwwrong");
    exit();
}else{

    $stmt2 = $connector->prepare("SELECT * FROM nutzer WHERE uid=? AND pwd=?");
    $stmt2->bind_param("ss", $username2, $password2);

    $username2 = $uid;
    $password2 = $hash_pw;

    $stmt2->execute();    

    $result = $stmt2->get_result();
    $stmt->close();

    if(!$row =$result->fetch_assoc()) 
    {
        echo "Your username or password is incorrect!";
    } else{
    $_SESSION['id'] = $row['id']; 
    $_SESSION['uid'] = $row['uid']; 
    $_SESSION['email'] = $row['email']; 
    $_SESSION['first'] = $row['first'];
    $_SESSION['last'] = $row['last'];
}

header("Location: ../loginscreen.php"); // go to page after signing in
}

---

仅适用于将来看到这一点的任何人。我发现我的hoster不支持get_result（）函数所需的MYSQLnd。我只是用fetch（）和bind_result（）编写了不同的代码。网络上有许多解决方案示例。
如果有一个空白屏幕，可能会抛出500个错误。检查您的错误日志，看看是否有可能发生的事情的提示。这是否意味着我的结果函数是错误的？可能与我得到的错误重复：PHP致命错误：调用include/login.inc.PHP第34行的未定义方法mysqli_stmt:：get_result（），referer:我将尝试使用它，谢谢您的帮助！