What are the best practices for separating application logic and output logic in PHP programming?

Separating application logic and output logic in PHP programming is essential for code organization and maintainability. One common practice is to use a template engine like Twig to separate the presentation layer from the business logic. This approach allows developers to keep the application logic in PHP files and the output logic in template files, making it easier to update the UI without affecting the underlying code. 

// Application logic in PHP file
$data = ['name' => 'John Doe', 'age' => 30];
$template = $twig->load('template.twig');
$output = $template->render($data);
echo $output;
```

```twig
{# Output logic in template.twig file #}
<!DOCTYPE html>
<html>
<head>
    <title>Hello, {{ name }}</title>
</head>
<body>
    <h1>Hello, {{ name }}! You are {{ age }} years old.</h1>
</body>
</html>

Keywords

MVC separation of concerns template engines PHP frameworks code organization

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