Taxonomy term management in Wordpress - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the output of this code when retrieving terms?

Consider this WordPress code snippet that retrieves terms from a taxonomy:

 $terms = get_terms(array('taxonomy' => 'category', 'hide_empty' => false));
echo count($terms);

What will be the output if there are 5 categories registered, but only 3 have posts assigned?

Wordpress

$terms = get_terms(array('taxonomy' => 'category', 'hide_empty' => false));
echo count($terms);

A 3

B 0

C 5

D Error: get_terms not found

💡 Hint

Check the 'hide_empty' parameter and what it controls.

The 'hide_empty' => false argument tells get_terms to return all terms, even those without posts. Since there are 5 categories registered, it returns all 5.

❓ state_output

intermediate

What is the value of $term_name after this code runs?

Given this code snippet:

 $term = get_term_by('slug', 'news', 'category');
 $term_name = $term->name ?? 'Not found';
 echo $term_name;

Assuming a category with slug 'news' exists and its name is 'Latest News', what will be printed?

Wordpress

$term = get_term_by('slug', 'news', 'category');
$term_name = $term->name ?? 'Not found';
echo $term_name;

A Latest News

B Error: Trying to get property of non-object

C Not found

D news

💡 Hint

get_term_by returns a term object or false if not found.

get_term_by returns the term object for slug 'news'. Accessing ->name gives 'Latest News'. The null coalescing operator ensures fallback if term is false.

📝 Syntax

advanced

Which option correctly registers a custom taxonomy with hierarchical terms?

You want to register a custom taxonomy called 'genre' for posts, allowing parent-child relationships between terms. Which code snippet correctly does this?

A register_taxonomy('genre', 'post', array('parent_child' => true));

B register_taxonomy('genre', 'post', array('hierarchical' => false));

C register_taxonomy('genre', array('post'), array('hierarchical' => 'yes'));

D register_taxonomy('genre', 'post', array('hierarchical' => true));

💡 Hint

Check the 'hierarchical' argument and its expected value type.

The 'hierarchical' argument must be boolean true to enable parent-child terms. Option D uses correct syntax and value.

🔧 Debug

advanced

Why does this code fail to add a term to a taxonomy?

This code tries to add a term 'Thriller' to the 'genre' taxonomy:

 wp_insert_term('Thriller', 'genres'); 

But it does not add the term. What is the likely cause?

Wordpress

wp_insert_term('Thriller', 'genres');

A wp_insert_term requires a third argument for term description.

B The taxonomy name is incorrect; it should be 'genre' not 'genres'.

C The term 'Thriller' already exists, so it won't add again.

D wp_insert_term only works for built-in taxonomies.

💡 Hint

Check the taxonomy slug spelling.

The taxonomy slug must match exactly. Using 'genres' instead of 'genre' causes the function to fail silently.

🧠 Conceptual

expert

What happens when you delete a taxonomy term that is assigned to posts?

In WordPress, if you delete a term from a taxonomy that is assigned to multiple posts, what is the expected behavior?

A The term is removed from all posts, but the posts remain intact.

B The posts assigned to the term are deleted automatically.

C The term cannot be deleted if assigned to posts; an error occurs.

D The posts keep the term ID, but it becomes orphaned and inaccessible.

💡 Hint

Think about how WordPress manages term relationships on deletion.

Deleting a term removes its association from posts but does not delete the posts themselves. Posts remain without that term.