What specific steps should be taken to structure and organize a PHP project for optimal efficiency and maintainability?

To structure and organize a PHP project for optimal efficiency and maintainability, it is recommended to follow a modular approach by dividing the project into separate directories for different components such as controllers, models, views, and helpers. Use an autoloader to automatically load classes and avoid manual require/include statements. Implement a consistent naming convention for files and classes, and use namespaces to prevent naming conflicts. Lastly, utilize version control systems like Git to track changes and collaborate with other developers effectively.

// Example of project structure

- project_root
  - controllers
    - UserController.php
    - ProductController.php
  - models
    - User.php
    - Product.php
  - views
    - user
      - index.php
      - edit.php
    - product
      - index.php
      - edit.php
  - helpers
    - CommonHelper.php
  - config
    - database.php
    - routes.php
  - vendor
    // Composer dependencies