What are the limitations of using PHP variables directly in HTML files?

When using PHP variables directly in HTML files, it can make the code less readable and maintainable. To solve this issue, it's better to separate the PHP logic from the HTML markup by using a template engine like Twig or Blade. These template engines allow you to easily pass variables from PHP to the HTML templates without cluttering the code. 

```php
// Example using Twig template engine
require_once 'vendor/autoload.php';

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

$variable = 'Hello World';

echo $twig->render('index.html', ['variable' => $variable]);
```

In this example, we are using Twig template engine to render the `index.html` template with the variable `variable`. This separates the PHP logic from the HTML markup, making the code more organized and maintainable.

Keywords

PHP variables HTML files limitations security vulnerabilities code readability

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