Example body class filter

example-body-class-filter.php

<?php 
/**
 * Do not call this function directly, add it to the body_class filter
 * 
 * Conditionally adds classes to the body class of a page for styling purposes.
 * These examples are from the Kmart Fashion and BirthdayClub themes.
 * 
 * @author Eddie Moya
 * 
 * @param type $classes
 * @return array 
 */
function filter_body_class($classes) {
    
    if (is_category())
        $classes[] = get_queried_object()->category_nicename;
  

    if(isset($_GET['s'])){
        $classes[] = 'search-results';
    }


    if(is_single()){

        if('section' == get_post_type()){
            $classes = array_diff($classes, array('single', 'single-section'));
        }
    }

    //print_pre($obj);
    
    return $classes;
}
add_filter('body_class', 'filter_body_class');