无法将登录表单连接到 MySQL 数据库
此查询涉及实现根据 MySQL 数据库进行验证的用户登录功能。用户期望输入用户名和密码，该用户名和密码应根据数据库中存储的凭据进行验证。不幸的是，虽然表单提交没有错误，但并没有实现想要的功能。
这个问题的根本原因在于缺乏针对 SQL 注入攻击的保护以及不安全在数据库中以纯文本形式存储密码。为了解决这些问题，建议：
Register.php：
<code class="php">// Replace previous code with the following:
session_start();
if (isset($_SESSION['userid'])) {
// Redirect to safe page
}
if (isset($_POST['register'])) {
$email = $_POST['email'];
$password = $_POST['password']; // Cleartext password from user
// New code for password hashing
$hashed_password = password_hash($password, PASSWORD_DEFAULT);
// Database connection and query
$host = "localhost";
$dbname = "database_name";
$user = "username";
$pass = "password";
try {
$conn = new PDO("mysql:host=$host;dbname=$dbname", $user, $pass);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $conn->prepare("INSERT INTO user_accounts (email, password) VALUES (?, ?)");
$stmt->execute([$email, $hashed_password]);
// Redirect to login page
$conn = null;
} catch (PDOException $e) {
throw $e;
}
}</code>Login.php:
<code class="php">// Replace previous code with the following:
session_start();
if (isset($_SESSION['userid'])) {
// Redirect to safe page
}
if (isset($_POST['login'])) {
$email = $_POST['email'];
$password = $_POST['password']; // Cleartext password from user
// Database connection and query
$host = "localhost";
$dbname = "database_name";
$user = "username";
$pass = "password";
try {
$conn = new PDO("mysql:host=$host;dbname=$dbname", $user, $pass);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// Get hashed password from database
$stmt = $conn->prepare("SELECT password FROM user_accounts WHERE email = ?");
$stmt->execute([$email]);
$hashed_db_password = $stmt->fetchColumn();
if (password_verify($password, $hashed_db_password)) {
// User authenticated successfully
$_SESSION['userid'] = true;
// Redirect to safe page
} else {
// Authentication failed
}
$conn = null;
} catch (PDOException $e) {
throw $e;
}
}</code>通过这些代码修改，用户登录现在应该通过与 MySQL 数据库安全交互来正常运行，从而防止SQL注入攻击和用户密码泄露。
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