How can PHP and HTML be effectively separated to maintain code cleanliness?

To effectively separate PHP and HTML code for cleanliness, it is recommended to use a templating engine like Twig or Blade. These engines allow you to write clean and organized templates with placeholders for dynamic data that can be filled in by PHP code. By separating the logic from the presentation, it becomes easier to maintain and understand the code.

// Example using Twig templating engine
$loader = new \Twig\Loader\FilesystemLoader('/path/to/templates');
$twig = new \Twig\Environment($loader);

// Render a template with dynamic data
echo $twig->render('template.twig', ['variable' => $value]);