How can the implementation of a template engine in PHP improve the flexibility and scalability of a login system compared to using traditional PHP includes for code organization?

Using a template engine in PHP can improve the flexibility and scalability of a login system by separating the presentation logic from the business logic. This allows for easier maintenance, reusability of code, and better organization of files. By using templates, changes to the design or layout of the login system can be made without affecting the underlying functionality.

// Example of implementing a template engine in PHP for a login system

// Include the template engine library
require_once 'template_engine.php';

// Define the login template
$loginTemplate = new TemplateEngine('login_template.php');

// Set the variables for the template
$loginTemplate->set('title', 'Login Page');
$loginTemplate->set('error_message', $error_message);

// Render the template
$loginTemplate->render();