How can the EVA principle be applied in PHP templating, and what are the advantages of using a templating engine like Twig or Smarty?

To apply the EVA principle in PHP templating, we can separate the logic (PHP code) from the presentation (HTML markup) by using a templating engine like Twig or Smarty. This helps improve code readability, maintainability, and reusability by keeping the business logic separate from the presentation layer. Example PHP code snippet using Twig templating engine: 

```php
// Include the Twig autoloader
require_once 'vendor/autoload.php';

// Specify the location of Twig templates
$loader = new Twig_Loader_Filesystem('templates');

// Initialize Twig environment
$twig = new Twig_Environment($loader);

// Render a Twig template with variables
echo $twig->render('index.html', ['name' => 'John Doe', 'age' => 30]);
```

In this code snippet, we are using Twig to render an `index.html` template file with variables `name` and `age`. Twig will handle the presentation layer while keeping the PHP logic separate.

Keywords

EVA principle PHP templating Twig Smarty advantages

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