Display a list of taxonomies, only if they are hierarchical - php

Question

I am trying to show a list of the taxonomies a custom post type is in, excluding those which aren't hierarchical.
The code below currently works but shows all taxonomies, however I can't get it to check if the taxonomy is hierarchical before running it through the loop.
I know there is a WordPress function that runs this check, but as I usually work front-end, I can't seem figure out where to put it in order for it to take effect:
is_taxonomy_hierarchical( $taxonomy )
The following is the function I am using to output a list of the taxonomies:
// get taxonomies terms links
function custom_taxonomies_terms_links(){
// get post by post id
$post = get_post( $post->ID );
// get post type by post
$post_type = $post->post_type;
// get post type taxonomies
$taxonomies = get_object_taxonomies( $post_type, 'objects' );
$out = array();
echo '<a href="';
echo '/';
echo '">';
echo 'Home';
echo "</a> / ";
foreach ( $taxonomies as $taxonomy_slug => $taxonomy ){
// get the terms related to post
$terms = get_the_terms( $post->ID, $taxonomy_slug );
if (!empty( $terms )) {
foreach ( $terms as $term ) {
$out[] =
'<a href="'
. get_term_link( $term->slug, $taxonomy_slug ) .'">'
. $term->name
. "</a> / ";
}
$out[] = " ";
}
}
return implode('', $out );
}

Answer 1

If I understand your correctly, couldn't you just test the taxonomy like the following:
foreach ( $taxonomies as $taxonomy_slug => $taxonomy ){
if ($taxonomy->hierarchical) {
// get the terms related to post
$terms = get_the_terms( $post->ID, $taxonomy_slug );
if (!empty( $terms )) {
foreach ( $terms as $term ) {
$out[] =
'<a href="'
. get_term_link( $term->slug, $taxonomy_slug ) .'">'
. $term->name
. "</a> / ";
}
$out[] = " ";
}
}
}
When you use 'objects' as the second parameter in:
get_object_taxonomies( $post_type, 'objects' );
what you get back is an array of taxonomy objects, as opposed to just taxonomy names (the other option). The taxonomy object has a property "hierarchical" that indicates whether that taxonomy is hierarchical or not. You can test this to choose the types of taxonomies (hierarchical or not) that you want.