[WP] Add custom body classes for better CSS customization

wp_add_body_classes.php

<?php

function add_classes_to_body($classes) {
    global $post;

	// User Role
	$user_info = get_currentuserinfo();
	$classes[] = implode(' ', $user_info->roles);
	// WPML
	if ( function_exists('icl_object_id') ) {
		$classes[] = ICL_LANGUAGE_CODE.' '.ICL_LANGUAGE_CODE.'-lang';
	}
	// Post Name
	if (is_page() || is_singular()) {
        $classes[] = $post->post_name;
	}
    // WooCommerce Product Categories
    $section_terms = get_the_terms($post->ID, 'product_cat');
    if ($section_terms && !is_wp_error($section_terms)) {
		$classes[] = "is_term term";
        foreach ($section_terms as $term) {
            if ($term->parent > 0) {
                $parentTerm = get_term($term->parent, 'product_cat');
                $classes[] = "term-parent term-" . $parentTerm->slug;
            } else {
                $classes[] = 'term-' . $term->slug;
			}
			if ( count( get_term_children( $section_terms->term_id, 'product_cat' ) ) > 0 ) {
				$classes[] = 'has-child';
			} else {
				$classes[] = 'no-child';
			}
        }
	}
	// Taxonomies
    if (is_tax()) {
        $qObj = get_queried_object();
        $parentTermId = $qObj->parent;
        if ($parentTermId) {
            $parentTerm = get_term($parentTermId);
            $classes[] = 'term-' . $parentTerm->slug;
        } else {
            $classes[] = 'term-' . $qObj->slug;
        }
	}
	// Mobile
	if(wp_is_mobile()) {
		$classes[] = 'is-mobile';
	}
	// Logged in
	if(is_user_logged_in()) {
		$classes[] = 'logged-in';
	}
    // MU
    /*$id = get_current_blog_id();
    $slug = strtolower(str_replace(' ', '-', trim(get_bloginfo('name'))));
    $classes[] = $slug;
	$classes[] = 'site-id-' . $id;*/
    return $classes;
}
add_filter('body_class', 'add_classes_to_body');

?>