<p>我正在为管理员制作一个登录页面，但是php代码中的while循环不起作用。我将在这里留下代码（对于代码中的西班牙语我很抱歉）</p> <pre class="brush:php;toolbar:false;">// 创建连接 $conn = mysqli_connect($servername, $username, $password, $dbname); // 检查连接 if (!$conn) { echo "连接服务器时发生错误。"; } $username = $_POST["username"]; if ($username != "") { $password = $_POST["password"]; $accountLevel = $_POST["accountLevel"]; $content = $_POST["content"]; $sql = "SELECT password, accountLevel FROM `accounts1` WHERE username='".$username."'"; $result = mysqli_query($conn, $sql); while ($post = $result-&gt;fetch_object()) { if ($post-&gt;password != $password) { echo "密码错误"; }else if ($post-&gt;accountLevel != $accountLevel) { echo "错误：无法发布。账户级别错误。"; }else{ $sql = "INSERT INTO `blogposts`(`title`, `contentHTML`, `publishDate`, `commentSection`, `likes`, `dislikes`, `publisher`, `selector`) VALUES ('','".$_POST['content']."','".$_POST['publishDate']."','',0,0,'".$_POST['username']."','')"; /*$fetchObj = mysqli_fetch_object($QueryResult); var_dump($fetchObj);*/ echo "已发送"; } } }else{ echo "未指定用户"; }</pre> <ul> <li><p>有没有办法用更简单的赋值方式替换while循环（因为它是一个登录页面，只检查一个帐户）</p> </li> <li><p>为什么while循环不起作用？我之前在另一个页面使用过相同的代码，它完全正常工作，而且我没有看到任何逻辑错误。</p> </li> </ul> <p>这是一个从带有函数的脚本发送的请求，并且我使用请求到Php页面。之后它会读取echo并在屏幕上显示。（只是为了防止有人需要这些信息）</p>

$username = $_POST["username"];
if ($username != "") {
    $password = $_POST["password"];
    $accountLevel = $_POST["accountLevel"];
    $content = $_POST["content"];
    $sql = "SELECT password, accountLevel FROM `accounts1` WHERE username=?";
    $stmt = $conn->prepare($sql);
    $stmt->bind_param("s", $username);
    $stmt->execute();
    $result = $stmt->get_result();
    $post = $result->fetch_object();
    if ($post) {
        if ($post->password != $password) {
            echo "Usuario o Contraseña incorrecta";
        }else if ($post->accountLevel != $accountLevel) {
            echo "Error: No se pudo Publicar. Error de nivel de cuenta.";
        }else{
            $sql = "INSERT INTO `blogposts`(`title`, `contentHTML`, `publishDate`, `commentSection`, `likes`, `dislikes`, `publisher`, `selector`) VALUES ('',?,?,'',0,0,?,'')";
            $stmt = $conn->prepare($sql);
            $stmt->bind_param("sss", $content, $_POST['publishDate'], $username);
            $stmt->execute();
            echo "Enviado";
        }
    } else {
        echo "Usuario o Contraseña incorrecta";
    }
}else{
    echo "Usuario no indicado";
}