What are the potential pitfalls of dynamically generating HTML content in PHP based on database queries like in the provided code snippet?

Potential pitfalls of dynamically generating HTML content in PHP based on database queries include security vulnerabilities such as SQL injection attacks, performance issues due to excessive database queries, and mixing presentation logic with business logic. To address these concerns, it is recommended to separate the concerns by using a template engine like Twig or Blade to handle the HTML generation, and utilize prepared statements or ORM libraries to prevent SQL injection.

// Using a template engine like Twig to separate concerns
require_once 'vendor/autoload.php';

$loader = new \Twig\Loader\FilesystemLoader('templates');
$twig = new \Twig\Environment($loader);

$data = [
    'users' => $users // assuming $users is an array of user data retrieved from the database
];

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