What potential issues can arise when 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. Separating these concerns can improve code readability and reusability. To solve this issue, it's recommended to use a template engine like Twig to handle the output logic separately from the application logic. 

// Example using Twig template engine to separate application logic and output logic

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

// Specify the location of Twig templates
$loader = new \Twig\Loader\FilesystemLoader('templates');

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

// Define variables for application logic
$variable1 = 'Hello';
$variable2 = 'World';

// Render Twig template with separate output logic
echo $twig->render('index.twig', ['variable1' => $variable1, 'variable2' => $variable2]);

Keywords

security vulnerabilities code maintainability separation of concerns XSS attacks data leakage

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