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Add category or categories slug(s) as class(es) to a category archive or single post as answered on Stackexchange question
// Adding categories name to body class on archives
function add_category_to_classes( $classes ) {
if ( is_single() ) {
global $post;
// assigns post it to variable to avoid reading an array for every loop iteration
// maybe a micro optmization? Guilty as charged!
$post_id = $post->ID;
foreach( ( get_the_category( $post_id ) ) as $category ) {
// add category slug to the $classes array
$classes[] = $category->category_nicename;
$classes[] = $category->category_nicename . '_index';
// check if in category
else if ( is_category() ) {
// get the queried object, in this case, a category object, and assigns to a variable
// see
$category_object = get_queried_object();
// get the slug
$classes[] = $category_object->slug;
$classes[] = $category_object->slug . '_index';
else {
$classes[] = 'index';
// return the $classes array
return $classes;
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