This WordPress snippet is very handy if you wish to add the category ID to the body or post-class for ie. targeting CSS styles and such.
Instructions
Add this to your functions.php
file.
<?php
function category_id_class($classes) {
global $post;
foreach((get_the_category($post->ID)) as $category)
$classes [] = 'cat-' . $category->cat_ID . '-id';
return $classes;
}
add_filter('post_class', 'category_id_class');
add_filter('body_class', 'category_id_class');
?>
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