In PHP, what best practices should be followed when separating the output generation from the function logic to improve code readability and maintainability?

When separating output generation from function logic in PHP, it's best practice to use a template engine like Twig or Blade to keep the presentation layer separate from the business logic. This separation improves code readability and maintainability by making it easier to update the UI without modifying the underlying logic. Additionally, using template engines allows for better organization of code and promotes the use of reusable components. 

// Function logic
function calculateTotal($price, $quantity) {
    return $price * $quantity;
}

// Output generation
$price = 10;
$quantity = 5;
$total = calculateTotal($price, $quantity);

// Using Twig template engine to display the total
$loader = new \Twig\Loader\FilesystemLoader('path/to/templates');
$twig = new \Twig\Environment($loader);
echo $twig->render('total.twig', ['total' => $total]);

Keywords

Separation of concerns MVC pattern template engines output buffering clean code

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