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/**
* LearnDash Get Course Steps Taxonomy Terms
* This utility function will gather all the steps within the course and all the taxonomy terms assigned to the steps
*
* @param $course_id - integer for course ID
* @param $course_step_types - array of course step post_types. Default is array( 'sfwd-lessons', 'sfwd-topic' )
* @param $course_step_taxonomies - array of taxonomies to limit the return. Default will be all associated taxonomies for each post type in $course_step_types
* @return array of taxonomy terms WP_Term
*/
function learndash_get_course_step_taxonomy_terms( $course_id = 0, $course_step_types = array( 'sfwd-lessons', 'sfwd-topic' ), $course_step_taxonomies = array() ) {
$course_steps = learndash_get_course_steps( $course_id, $course_step_types );
if ( !empty( $course_steps ) ) {
$post_terms = array();
$post_taxonomies = array();
foreach( $course_steps as $course_step_id ) {
$taxonomy_names = get_post_taxonomies( $course_step_id );
if ( !empty( $taxonomy_names ) ) {
foreach( $taxonomy_names as $taxonomy_name ) {
if ( ( empty( $course_step_taxonomies ) ) || ( in_array( $taxonomy_name, $course_step_taxonomies ) ) ) {
$terms = wp_get_post_terms( $course_step_id, $taxonomy_name, array( 'fields' => 'ids' ) );
if ( !empty( $terms ) ) {
$post_terms = array_merge( $post_terms, $terms );
}
}
}
}
}
if ( !empty( $post_terms ) ) {
$post_terms = array_unique( $post_terms );
$get_terms_args = array(
'taxonomy' => $course_step_taxonomies,
'include' => $post_terms,
'hide_empty' => false,
);
if ( !empty( $course_step_taxonomies ) ) {
$get_terms_args['taxonomy'] = $course_step_taxonomies;
}
$terms = get_terms( $get_terms_args );
return $terms;
}
}
}