Twig

A flexible, fast, and secure template engine for PHP that compiles templates down to plain optimized PHP code.

Twig serves as the industry standard for PHP templating (powering major frameworks like Symfony and Drupal). It eliminates the verbosity of raw PHP by using a concise syntax ({{ user.name }}) and provides a robust sandbox mode for executing untrusted code safely. With features like template inheritance, automatic output escaping, and a dedicated extension API, Twig ensures a clean separation of logic and presentation while maintaining high performance through its native C extension.

https://twig.symfony.com