多用户 php源码

<?php
session_start();

if (isset($_POST['username']) && isset($_POST['password'])) {
    $username = $_POST['username'];
    $password = $_POST['password'];

    // 验证用户名和密码
    if (validateUser($username, $password)) {
        $_SESSION['username'] = $username;
        header('Location: dashboard.php');
    } else {
        echo "Invalid credentials";
    }
}

function validateUser($username, $password) {
    // 连接数据库并验证用户
    // ...
    return true; // 假设验证成功
}
?>

<?php
try {
    $pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
    echo "Connection failed: " . $e->getMessage();
}
?>

<?php
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $username);
$username = $_POST['username'];
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>