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1. Jorinde
   Member
   Posted 1 year ago #

   Hello dear forum members,
   hope you can help me with my problem.

   I work with custom taxonomies. I have successfully registered them in my functions.php and used them to assign (multiple and hierarchically structured) values to my posts.

   My structure is similar to this example:
   Taxonomy: Habitat
   Terms:

   • A–America
     • a–USA
     • b–Canada
     • c–Mexiko
   • B–Europe
     • a–France
     • b–Spain
     • c–Italy

   etc.

   Now I want to display them via my single.php-Template. To do so, I used
   <?php the_terms( $post->ID, 'habitat', '<li> <strong>Habitat:</strong> ', ' ','</li>' ); ?>
   This works, but the output is unhierarchical, in alphabetic order, and looks like this, for example:
   

   Habitat: A-America, a–France, a–USA, B–Europe, b–Spain

   What I want is:
   

   Habitat: A-America, a–USA, B–Europe, a–France, b–Spain

   Is there a way to influence the sorting? Like, by ID?
   Thank you very much!

2. MichaelH
   Volunteer
   Posted 1 year ago #

   Haven't tried it but you might use wp_get_post_terms (the docs aren't quite complete)
   

   $taxonomy = 'habitat';
   $tax_args=array('orderby' => 't.term_id');
   $terms = wp_get_post_terms( $post->ID , $taxonomy, $tax_args);
   foreach ($terms as $term) {
   echo $term->slug;
   }

3. Jorinde
   Member
   Posted 1 year ago #

   Michael, thank you for your quick response.
   I tried your proposal: yes, it works: it returns the slugs, ordered by ID. What I need are the names, with a link to the respective archive (sorry for not being clear about that in my first post). I have figured out that I can get the name when I change slug to name. But what about the links?
   Thanks!

4. MichaelH
   Volunteer
   Posted 1 year ago #

   In the foreach put something like:
   

   echo '<a href="' . esc_attr(get_term_link($term, $taxonomy)) . '" title="' . sprintf( __( "View all posts in %s" ), $term->name ) . '" ' . '>' . $term->name.'</a> ';

5. Jorinde
   Member
   Posted 1 year ago #

   Fantastic! That is exactly what I was looking for.

   Now I only have two issues left:
   How can I exclude/hide empty taxonomies? In other words, with the original (non-sortable) solution that employed the_terms, I could define before and after bits—<li> <strong>Habitat:</strong> and </li>—that were displayed only when there was a value. How can I prevent such an empty label now?

   The other thing is: the hierarchy of the terms is not reflected by the URL. It is /habitat/france, instead of/habitat/europe/france. Can the URLs show the hierarchy? If there is no easy/known fix to the latter, I will dismiss the plan.

   Thank you for your patience.

6. MichaelH
   Volunteer
   Posted 1 year ago #

   What about an if statement?
   

   if ($terms) {
   foreach ($terms as $term) {
   echo $term->slug;
   }
   }

   Not sure about the URL question.

7. Jorinde
   Member
   Posted 1 year ago #

   Michael, that worked like charm!
   I promise to dig deeper into this whole PHP thing, thank you so much for providing me with the necessary pointers.

   This is my full code now. I use this bit about 12 times in the template, for the various taxonomies. Is there a downside to that?
   

   <?php $taxonomy = 'habitat';
   $tax_args=array('orderby' => 't.term_id');
   $terms = wp_get_post_terms( $post->ID , $taxonomy, $tax_args);
   if ($terms) {
   echo '<li> <strong>Habitat:</strong> ';
   foreach ($terms as $term) {
   echo '<a href="' . esc_attr(get_term_link($term, $taxonomy)) . '" title="' . sprintf( __( "View all posts in %s" ), $term->name ) . '" ' . '>' . $term->name.'</a> ';
   }
   echo '</li>';
   } ?>

8. MichaelH
   Volunteer
   Posted 1 year ago #

   Not real downside, but you could look into making it a function and just pass the taxonomy to the function--that way you'd only have 1 line in your template and the function in your theme's functions.php.

   I'll mark this resolved.

9. Jorinde
   Member
   Posted 1 year ago #

   Alright! Yes, my problem is solved. Thanks for your help.

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