What are some best practices for structuring and organizing PHP projects for optimal efficiency and scalability?

When structuring and organizing PHP projects for optimal efficiency and scalability, it is important to follow best practices such as using a modular approach, separating concerns, and utilizing design patterns like MVC. This helps in keeping the codebase clean, maintainable, and easy to scale as the project grows. 

// Example of using MVC design pattern in PHP project structure

// Controller file
class UserController {
    public function index() {
        // Logic for displaying user data
    }

    public function create() {
        // Logic for creating a new user
    }

    public function update() {
        // Logic for updating user data
    }

    public function delete() {
        // Logic for deleting a user
    }
}

// Model file
class User {
    public function getUser($id) {
        // Logic for fetching user data from database
    }

    public function createUser($data) {
        // Logic for creating a new user in database
    }

    public function updateUser($id, $data) {
        // Logic for updating user data in database
    }

    public function deleteUser($id) {
        // Logic for deleting a user from database
    }
}

// View file
// HTML and PHP code for displaying user data

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