Are there any best practices for organizing and including PHP files within a project to avoid class not found errors or other issues?

To avoid class not found errors or other issues when organizing and including PHP files within a project, it is best practice to use autoloading with namespaces. This allows for automatic loading of classes without the need for manual includes or requires, ensuring that all dependencies are resolved correctly.

// Autoloading with namespaces
spl_autoload_register(function ($class) {
    // Define the base directory for the namespace prefix
    $base_dir = __DIR__ . '/src/';

    // Remove the namespace prefix and replace with the directory separator
    $file = $base_dir . str_replace('\\', '/', $class) . '.php';

    // If the file exists, require it
    if (file_exists($file)) {
        require $file;
    }
});