What potential pitfalls can arise from combining application logic and output logic in PHP code?

Combining application logic and output logic in PHP code can lead to code that is difficult to maintain and debug. It is best practice to separate these concerns to improve code readability and reusability. To solve this issue, you can use a template engine like Twig to handle the output logic separately from the application logic. 

```php
// Using Twig template engine to separate application logic and output logic

// Include Twig autoloader
require_once 'vendor/autoload.php';

// Specify the location of Twig templates
$loader = new Twig_Loader_Filesystem('templates');

// Instantiate Twig environment
$twig = new Twig_Environment($loader);

// Define application logic
$variable = 'Hello, World!';

// Render the template with separate output logic
echo $twig->render('index.html', ['variable' => $variable]);
```

In this code snippet, we are using the Twig template engine to separate the application logic (defining the variable) from the output logic (rendering the template). This approach improves code organization and maintainability.

Keywords

tight coupling separation of concerns MVC architecture code maintainability debugging difficulties

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