首先,假设你有一个名为 users 的表,包含至少 username 和 password 字段。
- CREATE TABLE users (
- id INT AUTO_INCREMENT PRIMARY KEY,
- username VARCHAR(50) NOT NULL,
- password VARCHAR(255) NOT NULL
- );
复制代码- <?php
- if ($_SERVER["REQUEST_METHOD"] == "POST") {
- // 连接数据库
- $conn = new mysqli('localhost', 'username', 'password', 'database_name');
-
- // 检查连接
- if ($conn->connect_error) {
- die("Connection failed: " . $conn->connect_error);
- }
- // 获取用户名和密码
- $username = $_POST['username'];
- $password = password_hash($_POST['password'], PASSWORD_DEFAULT); // 密码加密
- // 插入数据
- $sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
- if ($conn->query($sql) === TRUE) {
- echo "New record created successfully";
- } else {
- echo "Error: " . $sql . "<br>" . $conn->error;
- }
- $conn->close();
- }
- ?>
复制代码- <?php
- session_start();
- if ($_SERVER["REQUEST_METHOD"] == "POST") {
- // 连接数据库
- $conn = new mysqli('localhost', 'username', 'password', 'database_name');
-
- // 检查连接
- if ($conn->connect_error) {
- die("Connection failed: " . $conn->connect_error);
- }
- $username = $_POST['username'];
- $password = $_POST['password'];
- $sql = "SELECT id, password FROM users WHERE username = '$username'";
- $result = $conn->query($sql);
- if ($result->num_rows > 0) {
- $row = $result->fetch_assoc();
- if (password_verify($password, $row['password'])) {
- // 密码匹配,登录成功
- $_SESSION['loggedin'] = true;
- $_SESSION['username'] = $username;
- echo "Login successful";
- } else {
- // 密码不匹配
- echo "Invalid password";
- }
- } else {
- echo "Invalid username";
- }
- $conn->close();
- }
- ?>
复制代码- <?php
- session_start();
- // 销毁所有会话变量
- $_SESSION = array();
- // 销毁会话
- session_destroy();
- echo "Logged out successfully";
- ?>
复制代码
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