How to perform user registration and login verification for PHP flash sale system

Title: Detailed explanation of user registration and login verification of PHP flash kill system

PHP flash kill system is a common high-concurrency application. In order to ensure the stability and security of the system , user registration and login verification are indispensable links. This article will introduce in detail how to implement user registration and login verification of the PHP flash sale system, and provide specific code examples.

1. User registration
User registration refers to the creation of accounts by users in the flash sale system. When implementing the user registration function, you need to pay attention to the following points:

1.1 Legality detection of user name and password
When a user registers, it is necessary to check the legality of the user name and password, such as determining whether the user name has been existence, whether the password meets the length and complexity requirements, etc. The following is a simple code example:

// 获取用户提交的用户名和密码
$username = $_POST['username'];
$password = $_POST['password'];

// 判断用户名是否已存在
$sql = "SELECT * FROM users WHERE username='$username'";
$result = mysqli_query($conn, $sql);
if(mysqli_num_rows($result) > 0) {
    echo "用户名已存在";
    exit;
}

// 判断密码长度是否符合要求
if(strlen($password) < 6) {
    echo "密码长度不能少于6位";
    exit;
}

// 密码加密存储
$hashedPassword = password_hash($password, PASSWORD_DEFAULT);

// 将用户名和加密后的密码插入数据库
$sql = "INSERT INTO users (username, password) VALUES ('$username', '$hashedPassword')";
mysqli_query($conn, $sql);

echo "注册成功";

1.2 Security of user name and password
In order to ensure the security of user data, user passwords should be encrypted and stored. In the above example, the password_hash function is used to encrypt the password. In login verification, use the password_verify function to verify whether the password entered by the user is correct. The following is a simple code example:

// 获取用户提交的用户名和密码
$username = $_POST['username'];
$password = $_POST['password'];

// 根据用户名从数据库中获取用户信息
$sql = "SELECT * FROM users WHERE username='$username'";
$result = mysqli_query($conn, $sql);
$row = mysqli_fetch_assoc($result);

// 验证密码是否正确
if(password_verify($password, $row['password'])) {
    echo "登录成功";
} else {
    echo "用户名或密码错误";
}

2. User login verification
User login verification refers to the user's login operation using a registered account in the flash sale system. The following is a code example for user login verification:

// 获取用户提交的用户名和密码
$username = $_POST['username'];
$password = $_POST['password'];

// 根据用户名从数据库中获取用户信息
$sql = "SELECT * FROM users WHERE username='$username'";
$result = mysqli_query($conn, $sql);
$row = mysqli_fetch_assoc($result);

// 验证密码是否正确
if(password_verify($password, $row['password'])) {
    echo "登录成功";
} else {
    echo "用户名或密码错误";
}

When performing user login verification, you need to pay attention to security issues, such as using verification codes, limiting the number of login attempts, and other measures to prevent brute force cracking and malicious logins.

3. Summary
This article introduces in detail how to perform user registration and login verification of the PHP flash sale system, and provides corresponding code examples. In actual development, appropriate modifications and improvements need to be made based on specific needs and system architecture. User registration and login verification are the basis for system security and stable operation. Developers should pay attention to and take appropriate measures to ensure the security of user information.

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