无法连接到 MySQL - 用户名或密码无效

Question

我是编码新手，目前正在努力将我的注册页面连接到 MySQL。用户名、密码、主机和数据库名称都是正确的。

代码结果：

登录页面：

<?php
        session_start();
        if ($_SERVER["REQUEST_METHOD"] == "POST") {
            $host = "127.0.0.1";
            $dbUsername = "root";
            $dbPassword = "";
            $dbName = "website_db";
            $conn = new mysqli($host, $dbUsername, $dbPassword, $dbName);
            if ($conn->connect_error) {
                die("Connection failed: " . $conn->connect_error);
            }
            $username = $_POST['username'];
            $password = $_POST['password'];
    $stmt = $conn->prepare("SELECT * FROM Users WHERE user_name = ?AND paswd = ?");
            $stmt->bind_param("ss", $username, $password);
            $stmt->execute();
            $result = $stmt->get_result();
            if ($result->num_rows === 1) {
                $_SESSION['logged_in'] = true;
                header("Location: main_page.php");
                exit();
            } 
            else {
                echo "<p>Invalid username or password!</p>";
            }
            $stmt->close();
            $conn->close();`
        }
?>

我尝试检查 phpmyadmin

config.inc.php file

以检查用户名、密码和主机是否正确（它们是），并尝试重新安装 XAMPP 以查看是否也能正常工作。我还尝试过在

127.0.0.7

和

localhost

之间切换主机名。

Answer 1

我遇到了类似的问题，并且我的值周围没有引号（即 $dbPassword 应该是 '$dbPassword'）

<?php
        session_start();
        if ($_SERVER["REQUEST_METHOD"] == "POST") {
            $host = "127.0.0.1";
            $dbUsername = "root";
            $dbPassword = "";
            $dbName = "website_db";
            $conn = new mysqli('$host', '$dbUsername', '$dbPassword', '$dbName');
            if ($conn->connect_error) {
                die("Connection failed: " . $conn->connect_error);
            }
            $username = $_POST['username'];
            $password = $_POST['password'];
    $stmt = $conn->prepare("SELECT * FROM Users WHERE user_name = ?AND paswd = ?");
            $stmt->bind_param("ss", '$username', '$password');
            $stmt->execute();
            $result = $stmt->get_result();
            if ($result->num_rows === 1) {
                $_SESSION['logged_in'] = true;
                header("Location: main_page.php");
                exit();
            } 
            else {
                echo "<p>Invalid username or password!</p>";
            }
            $stmt->close();
            $conn->close();`
        }
?>