What are potential pitfalls when dealing with a large number of PHP and HTML files in a project?

One potential pitfall when dealing with a large number of PHP and HTML files in a project is the lack of organization and difficulty in managing dependencies. To solve this issue, it is recommended to use a modular approach by breaking down the code into smaller, reusable components and utilizing autoloading to efficiently load classes and files when needed.

// Example of using autoloading to efficiently load classes in PHP

spl_autoload_register(function($class) {
    include 'classes/' . $class . '.php';
});