# Twig ## Purpose Custom Twig extensions exposing PHP helpers to templates. ## Key Files | File | Description | |------|-------------| | `AppExtension.php` | Registers the `file_exists(path)` Twig function, which checks `DOCUMENT_ROOT . path` on disk. Used in templates to conditionally include optional assets (e.g. a product image that may not exist) | ## For AI Agents ### Working In This Directory - Registered via the `twig.extension` tag in `config/services.yaml`. - `file_exists()` resolves paths against `$_SERVER['DOCUMENT_ROOT']`, i.e. the `public/` web root — pass web-absolute paths like `/assets/product/xyz.webp`. - Add new template helpers here as `TwigFunction`/`TwigFilter` entries; keep them thin (delegate real logic to services/entities). ## Dependencies ### Internal - Used across `templates/` (notably product/image includes). ### External - Twig 3 (`AbstractExtension`, `TwigFunction`).