What are some best practices for separating program logic from display logic in PHP web development?

Separating program logic from display logic is important in PHP web development to improve code readability, maintainability, and reusability. One common approach is to use a template engine like Twig or Smarty to separate the HTML markup from the PHP logic. This allows developers to focus on the business logic in PHP files and keep the presentation logic in separate template files. 

// Example of separating program logic from display logic using Twig template engine

// index.php
require_once 'vendor/autoload.php';

$loader = new Twig_Loader_Filesystem('templates');
$twig = new Twig_Environment($loader);

$data = [
    'title' => 'Welcome to my website',
    'content' => 'This is the homepage content',
];

echo $twig->render('index.html', $data);

// templates/index.html
<!DOCTYPE html>
<html>
<head>
    <title>{{ title }}</title>
</head>
<body>
    <h1>{{ title }}</h1>
    <p>{{ content }}</p>
</body>
</html>

Keywords

MVC template engines separation of concerns PHP frameworks view layer

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