What are some best practices for structuring PHP scripts for user data manipulation and email notifications?

When structuring PHP scripts for user data manipulation and email notifications, it is important to separate concerns and follow best practices for maintainability and scalability. One approach is to create separate functions or classes for handling user data manipulation and email notifications, ensuring a clear separation of responsibilities.

// Example of structuring PHP scripts for user data manipulation and email notifications

// User data manipulation functions
function createUser($userData) {
    // Logic to create a new user
}

function updateUser($userId, $newData) {
    // Logic to update user data
}

function deleteUser($userId) {
    // Logic to delete a user
}

// Email notification functions
function sendEmailNotification($recipient, $subject, $message) {
    // Logic to send an email notification
}

// Example usage
$userData = array(
    'username' => 'john_doe',
    'email' => 'john.doe@example.com'
);

createUser($userData);

updateUser(1, array('email' => 'john_doe_updated@example.com'));

deleteUser(1);

sendEmailNotification('john.doe@example.com', 'Welcome!', 'Welcome to our platform!');