超详细！PHP用户登录程序代码大揭秘

<?php // 连接数据库 $host = "localhost"; $username = "root"; $password = ""; $database = "your_database_name"; $connection = new mysqli($host, $username, $password, $database); if ($connection->connect_error) { die("Connection failed: " . $connection->connect_error); } // 获取用户输入的用户名和密码 $username = $_POST['username']; $password = $_POST['password']; // 查询数据库中是否存在该用户 $query = "SELECT * FROM users WHERE username='$username' AND password='$password'"; $result = $connection->query($query); if ($result->num_rows > 0) { echo "登录成功"; } else { echo "用户名或密码错误"; } // 关闭数据库连接 $connection->close(); ?> ######[AI写代码神器 | 447点数解答 | 2024-11-19 02:43:34]