.twig File — Twig Template

Twig is a modern template engine for PHP, created by Fabien Potencier (creator of the Symfony framework). TWIG files use a syntax inspired by Jinja2 (Python) with {{ }} for expressions, {% %} for statements, and {# #} for comments. Twig provides template inheritance (extends/block pattern), includes, macros (reusable template functions), filters for value transformation, tests for conditional checks, and automatic output escaping for XSS prevention. The template inheritance system allows defining base layouts with overridable blocks, enabling clean template hierarchies. Twig compiles templates to optimized PHP code for production performance. The engine is the default template engine for Symfony, one of the most popular PHP frameworks, and is also used by Drupal 8+, Craft CMS, and Grav CMS. Twig's sandboxing feature restricts which tags, filters, and functions are available in untrusted templates. The language supports internationalization through the trans tag, and custom extensions can add project-specific functionality. Twig's design balances power with security, providing enough features for complex template logic while preventing template authors from introducing security vulnerabilities.