What are some best practices for separating functionality and appearance in PHP code to avoid having to make changes in multiple files?

When separating functionality and appearance in PHP code, it is best to use a template engine like Twig or Smarty. By using template engines, you can keep your HTML markup separate from your PHP logic, making it easier to make changes to the appearance without affecting the functionality. This separation also allows for better organization and maintainability of your code. 

```php
// Using Twig template engine to separate functionality and appearance

// Include the Twig library
require_once 'vendor/autoload.php';

// Initialize Twig with the templates directory
$loader = new Twig_Loader_Filesystem('templates');
$twig = new Twig_Environment($loader);

// Render the template with data
echo $twig->render('index.html', ['title' => 'Homepage', 'content' => 'Welcome to our website']);
```
In this example, we are using Twig as the template engine to separate the functionality (PHP logic) from the appearance (HTML markup). The Twig template 'index.html' contains placeholders for the title and content, which are passed as an array to the render method. This approach allows for easy modification of the appearance without having to make changes in multiple files.

Keywords

separation of concerns MVC architecture template engines PHP includes code refactoring

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