What considerations should be made when structuring classes and methods to handle login and registration processes in PHP applications?

When structuring classes and methods to handle login and registration processes in PHP applications, it is important to separate concerns and follow the principles of object-oriented programming. This can be achieved by creating separate classes for handling user authentication, registration, and user data storage. Additionally, methods should be designed to handle specific tasks such as validating user input, hashing passwords securely, and interacting with the database. 

class UserAuthentication {
    public function login($username, $password) {
        // Validate user input
        // Hash the password securely
        // Check if the user exists in the database
        // Set session variables upon successful login
    }

    public function register($username, $password, $email) {
        // Validate user input
        // Hash the password securely
        // Insert user data into the database
    }
}

class Database {
    public function getUserByUsername($username) {
        // Query the database to fetch user data by username
    }

    public function insertUser($username, $password, $email) {
        // Insert user data into the database
    }
}

// Example of using the classes
$userAuth = new UserAuthentication();
$userAuth->register('john_doe', 'password123', 'john.doe@example.com');
$userAuth->login('john_doe', 'password123');

Keywords

authentication authorization password hashing session management form validation

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