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// Output LearnDash classes inside of WP Body Class
add_filter('body_class','add_category_to_single');
function add_category_to_single($classes) {
if (is_single() ) {
global $post;
// a) Ensure $post is not empty.
// b) Ensure $post is a WP_Post object.
// c) Ensure $post is a LD Course or Lesson or Topic.
if ( ( $post ) && ( is_a( $post, 'WP_Post' ) ) ) {
if ( $post->post_type == 'sfwd-courses' ) {
// Get the post terms from 'ld_course_category'.
$terms = get_the_terms( $post->ID, 'ld_course_category' );
}
else if ( $post->post_type == 'sfwd-lessons' ) { // Get the post terms from 'ld_lessons_category'.
$terms = get_the_terms( $post->ID, 'ld_lesson_category' );
}
else if ( $post->post_type == 'sfwd-topic' ) { // Get the post terms from 'ld_topic_category'.
$terms = get_the_terms( $post->ID, 'ld_topic_category' ) ;
}
// Check that there are terms and not an error.
if ( ( isset( $terms ) ) && ( ! is_wp_error( $terms ) ) ) {
foreach( $terms as $category ) {
// add category slug to the $classes array
$classes[] = $category->slug;
}
}
}
}
// return the $classes array
return $classes;
}