Core constants, configuration, and utility functions.

Theme Constants

Location: functions.php

EXTRACHILL_PARENT_DIR

Theme root directory path.

define('EXTRACHILL_PARENT_DIR', get_template_directory());

Value: /path/to/wp-content/themes/extrachill

Usage:

require_once( EXTRACHILL_PARENT_DIR . '/file.php' );

EXTRACHILL_INCLUDES_DIR

Inc directory path for modular includes.

define('EXTRACHILL_INCLUDES_DIR', EXTRACHILL_PARENT_DIR . '/inc');

Value: /path/to/wp-content/themes/extrachill/inc

Usage:

require_once( EXTRACHILL_INCLUDES_DIR . '/core/actions.php' );

Theme Setup

Function: extrachill_setup()
Hook: after_setup_theme

Features Enabled

function extrachill_setup() {
    // Translation support
    load_theme_textdomain('extrachill', get_template_directory() . '/languages');

    // Automatic feed links
    add_theme_support('automatic-feed-links');

    // Post thumbnails
    add_theme_support('post-thumbnails');

    // Title tag support
    add_theme_support('title-tag');

    // Page excerpts
    add_post_type_support('page', 'excerpt');

    // Block editor styles
    add_theme_support( 'editor-styles' );
    add_editor_style( 'assets/css/root.css' );
    add_editor_style( 'assets/css/editor-style.css' );
    add_editor_style( 'style.css' );
    add_editor_style( 'assets/css/single-post.css' );

    // HTML5 support
    add_theme_support('html5', array(
        'search-form',
        'comment-form',
        'comment-list',
        'gallery',
        'caption',
        'script'
    ));

    // Custom logo
    add_theme_support('custom-logo', array(
        'flex-width' => true,
        'flex-height' => true
    ));
}

Block Editor Support

Theme supports:

• Responsive embeds
• Block styles
• Wide alignment
• Editor styles (4 CSS files)
• Share buttons in editor
• Notice system integration

add_theme_support( 'responsive-embeds' );
add_theme_support( 'wp-block-styles' );
add_theme_support( 'align-wide' );

Image Size Management

Unregister Default Sizes

function extrachill_unregister_image_sizes() {
    remove_image_size('thumbnail');
    remove_image_size('2048x2048');
}
add_action('init', 'extrachill_unregister_image_sizes', 99);

Reason: Reduces server storage and processing for unused image sizes

File Upload Support

SVG Upload Support

function add_file_types_to_uploads($file_types) {
    $new_filetypes['svg'] = 'image/svg+xml';
    return array_merge($file_types, $new_filetypes);
}
add_action('upload_mimes', 'add_file_types_to_uploads');

Enables: SVG file uploads in media library

Performance Optimizations

Admin Styles Prevention

function extrachill_prevent_admin_styles_on_frontend() {
    if ( is_admin() ) {
        return;
    }

    if ( ! is_user_logged_in() || ! is_admin_bar_showing() ) {
        wp_dequeue_style( 'admin-bar' );
    }

    wp_dequeue_style( 'imagify-admin-bar' );

    wp_dequeue_style( 'wp-block-library-theme' );
}
add_action( 'wp_enqueue_scripts', 'extrachill_prevent_admin_styles_on_frontend', 100 );

Sticky Header Control

Body Class Filter

function extrachill_add_sticky_header_class( $classes ) {
    if ( apply_filters( 'extrachill_enable_sticky_header', true ) ) {
        $classes[] = 'sticky-header';
    }
    return $classes;
}
add_filter( 'body_class', 'extrachill_add_sticky_header_class' );

Filter: extrachill_enable_sticky_header
Default: Enabled (true)

Disable Globally:

add_filter( 'extrachill_enable_sticky_header', '__return_false' );

Disable Conditionally:

add_filter( 'extrachill_enable_sticky_header', function( $enabled ) {
    return ! is_page( 'no-sticky' );
} );

Theme Textdomain

Domain: extrachill
Directory: /languages/

All translatable strings use 'extrachill' textdomain:

__( 'Search Locations', 'extrachill' )
_x( 'Artists', 'taxonomy general name', 'extrachill' )
esc_html_e( 'No results found', 'extrachill' )