roi-theme/wp-content/themes/apus-theme/functions.php

<?php
/**
 * Apus Theme Functions and Definitions
 *
 * @package Apus_Theme
 * @since 1.0.0
 */

// Exit if accessed directly
if (!defined('ABSPATH')) {
    exit;
}

/**
 * Theme Version
 */
define('APUS_VERSION', '1.0.0');

/**
 * Theme Setup
 */
function apus_theme_setup() {
    // Make theme available for translation
    load_theme_textdomain('apus-theme', get_template_directory() . '/languages');

    // Add default posts and comments RSS feed links to head
    add_theme_support('automatic-feed-links');

    // Let WordPress manage the document title
    add_theme_support('title-tag');

    // Enable support for Post Thumbnails
    add_theme_support('post-thumbnails');

    // Add image sizes
    add_image_size('apus-thumbnail', 400, 300, true);
    add_image_size('apus-medium', 800, 600, true);
    add_image_size('apus-large', 1200, 900, true);
    add_image_size('apus-featured-large', 1200, 600, true);
    add_image_size('apus-featured-medium', 800, 400, true);

    // Switch default core markup to output valid HTML5
    add_theme_support('html5', array(
        'search-form',
        'comment-form',
        'comment-list',
        'gallery',
        'caption',
        'style',
        'script',
    ));

    // Set content width
    if (!isset($content_width)) {
        $content_width = 1200;
    }

    // Register navigation menus
    register_nav_menus(array(
        'primary' => __('Primary Menu', 'apus-theme'),
        'footer'  => __('Footer Menu', 'apus-theme'),
    ));
}
add_action('after_setup_theme', 'apus_theme_setup');

/**
 * Set the content width in pixels
 */
function apus_content_width() {
    $GLOBALS['content_width'] = apply_filters('apus_content_width', 1200);
}
add_action('after_setup_theme', 'apus_content_width', 0);

/**
 * Enqueue Scripts and Styles
 */
function apus_enqueue_scripts() {
    // Main stylesheet
    wp_enqueue_style(
        'apus-theme-style',
        get_stylesheet_uri(),
        array(),
        APUS_VERSION
    );

    // Print styles
    wp_enqueue_style(
        'apus-print-style',
        get_template_directory_uri() . '/assets/css/print.css',
        array('apus-theme-style'),
        APUS_VERSION,
        'print'
    );
}
add_action('wp_enqueue_scripts', 'apus_enqueue_scripts');

/**
 * Register Widget Areas
 */
function apus_register_widget_areas() {
    // Primary Sidebar
    register_sidebar(array(
        'name'          => __('Primary Sidebar', 'apus-theme'),
        'id'            => 'sidebar-1',
        'description'   => __('Main sidebar widget area', 'apus-theme'),
        'before_widget' => '<section id="%1$s" class="widget %2$s">',
        'after_widget'  => '</section>',
        'before_title'  => '<h2 class="widget-title">',
        'after_title'   => '</h2>',
    ));

    // Footer Widget Areas
    for ($i = 1; $i <= 4; $i++) {
        register_sidebar(array(
            'name'          => sprintf(__('Footer Column %d', 'apus-theme'), $i),
            'id'            => 'footer-' . $i,
            'description'   => sprintf(__('Footer widget area %d', 'apus-theme'), $i),
            'before_widget' => '<div id="%1$s" class="widget %2$s">',
            'after_widget'  => '</div>',
            'before_title'  => '<h3 class="widget-title">',
            'after_title'   => '</h3>',
        ));
    }
}
add_action('widgets_init', 'apus_register_widget_areas');

/**
 * Configure locale and date format
 */
function apus_configure_locale() {
    // Set locale to es_MX
    add_filter('locale', function($locale) {
        return 'es_MX';
    });
}
add_action('after_setup_theme', 'apus_configure_locale');

/**
 * Custom date format
 */
function apus_custom_date_format($format) {
    return 'd/m/Y'; // Format: day/month/year
}
add_filter('date_format', 'apus_custom_date_format');

/**
 * Include modular files
 */
// Sanitize Functions (load first to avoid redeclaration errors)
if (file_exists(get_template_directory() . '/inc/sanitize-functions.php')) {
    require_once get_template_directory() . '/inc/sanitize-functions.php';
}

// Theme Options Helpers (load first as other files may depend on it)
if (file_exists(get_template_directory() . '/inc/theme-options-helpers.php')) {
    require_once get_template_directory() . '/inc/theme-options-helpers.php';
}

// Admin Options API
if (is_admin()) {
    if (file_exists(get_template_directory() . '/inc/admin/options-api.php')) {
        require_once get_template_directory() . '/inc/admin/options-api.php';
    }
    if (file_exists(get_template_directory() . '/inc/admin/theme-options.php')) {
        require_once get_template_directory() . '/inc/admin/theme-options.php';
    }
}

// Bootstrap and Script Enqueuing
if (file_exists(get_template_directory() . '/inc/enqueue-scripts.php')) {
    require_once get_template_directory() . '/inc/enqueue-scripts.php';
}

// Font customizer options
if (file_exists(get_template_directory() . '/inc/customizer-fonts.php')) {
    require_once get_template_directory() . '/inc/customizer-fonts.php';
}

// SEO optimizations and Rank Math compatibility
if (file_exists(get_template_directory() . '/inc/seo.php')) {
    require_once get_template_directory() . '/inc/seo.php';
}

// Performance optimizations
if (file_exists(get_template_directory() . '/inc/performance.php')) {
    require_once get_template_directory() . '/inc/performance.php';
}

// Critical CSS (optional, disabled by default)
if (file_exists(get_template_directory() . '/inc/critical-css.php')) {
    require_once get_template_directory() . '/inc/critical-css.php';
}

// Image optimization
if (file_exists(get_template_directory() . '/inc/image-optimization.php')) {
    require_once get_template_directory() . '/inc/image-optimization.php';
}

// Template functions
if (file_exists(get_template_directory() . '/inc/template-functions.php')) {
    require_once get_template_directory() . '/inc/template-functions.php';
}

// Template tags
if (file_exists(get_template_directory() . '/inc/template-tags.php')) {
    require_once get_template_directory() . '/inc/template-tags.php';
}

// Featured image functions
if (file_exists(get_template_directory() . '/inc/featured-image.php')) {
    require_once get_template_directory() . '/inc/featured-image.php';
}

// Category badge functions
if (file_exists(get_template_directory() . '/inc/category-badge.php')) {
    require_once get_template_directory() . '/inc/category-badge.php';
}

// AdSense delay loading
if (file_exists(get_template_directory() . '/inc/adsense-delay.php')) {
    require_once get_template_directory() . '/inc/adsense-delay.php';
}

// Related posts functionality
if (file_exists(get_template_directory() . '/inc/related-posts.php')) {
    require_once get_template_directory() . '/inc/related-posts.php';
}

// Table of Contents
if (file_exists(get_template_directory() . '/inc/toc.php')) {
    require_once get_template_directory() . '/inc/toc.php';
}