# Functionality

The app/ directory contains all of the theme functionality. Since Sage is a starter theme, it’s okay for you to modify files within app/ to meet the needs of the site you’re building.

The PHP code in Sage is namespaced, so make sure to use namespaced functions and classes (opens new window).

app/setup.php – Enqueue stylesheets and scripts, register support for theme features with add_theme_support, register navigation menus and sidebars. See Theme Configuration and Setup.
app/admin.php – Placeholder code for the WordPress theme customizer. You can also use this file for anything related to the WordPress admin.
app/filters.php – Add WordPress filters in this file. Filters included by default:
- body_class – add <body> classes
- excerpt_more – add "… Continued" to excerpts
- template_include – enable the theme wrapper
- Various filters for the Blade implementation
app/helpers.php – Helper functions used throughout the theme:
- asset_path – used when enqueueing theme assets to provide the correct versioned asset filenames
- display_sidebar – used to control displaying the sidebar
- title – used to return page titles

Page authors:

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