Custom taxonomies in Wordpress - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to register a custom taxonomy called 'genre'.

Wordpress

<?php
register_taxonomy('[1]', 'book', array(
  'label' => 'Genres',
  'hierarchical' => true
));
?>

Drag options to blanks, or click blank then click option'

Atag

Bcategory

Cgenre

Dauthor

Attempts:

3 left

💡 Hint

Common Mistakes

Using built-in taxonomy names like 'category' or 'tag' instead of a custom name.

Forgetting to put the taxonomy name as the first argument.

The first argument to register_taxonomy is the taxonomy name. Here, it should be 'genre' to create a custom taxonomy named 'genre'.

2fill in blank

medium

Complete the code to attach the 'genre' taxonomy to the 'book' post type.

Wordpress

<?php
register_taxonomy('genre', '[1]', array(
  'label' => 'Genres',
  'hierarchical' => true
));
?>

Drag options to blanks, or click blank then click option'

Abook

Bpage

Cpost

Dmovie

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different post type like 'post' or 'page' instead of 'book'.

Passing an array instead of a string when only one post type is used.

The second argument to register_taxonomy is the post type(s) the taxonomy applies to. Here, it should be 'book' to attach 'genre' to the 'book' post type.

3fill in blank

hard

Fix the error in the code to make the taxonomy hierarchical.

Wordpress

<?php
register_taxonomy('genre', 'book', array(
  'label' => 'Genres',
  'hierarchical' => [1]
));
?>

Drag options to blanks, or click blank then click option'

A'true'

Btrue

C1

D'false'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'true' as a string instead of boolean true.

Using 1 instead of true (works but less clear).

The 'hierarchical' argument expects a boolean true or false, not a string. Use true without quotes to make the taxonomy hierarchical.

4fill in blank

hard

Fill both blanks to register a non-hierarchical taxonomy called 'topic' for posts.

Wordpress

<?php
register_taxonomy('[1]', '[2]', array(
  'label' => 'Topics',
  'hierarchical' => false
));
?>

Drag options to blanks, or click blank then click option'

Atopic

Bpost

Cpage

Dcategory

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'category' as taxonomy name which is built-in.

Attaching taxonomy to 'page' instead of 'post'.

The taxonomy name is 'topic' and it is attached to the 'post' post type.

5fill in blank

hard

Fill all three blanks to register a custom taxonomy 'skill_level' for a custom post type 'course' with labels and hierarchical true.

Wordpress

<?php
register_taxonomy('[1]', '[2]', array(
  'label' => '[3]',
  'hierarchical' => true
));
?>

Drag options to blanks, or click blank then click option'

Askill_level

Bcourse

CSkill Levels

Dlevel

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase label without spaces.

Mixing up taxonomy name and label.

The taxonomy name is 'skill_level', attached to 'course' post type, and label is 'Skill Levels'.

Practice

1. What is the main purpose of creating a custom taxonomy in WordPress?

easy

A. To increase website loading speed

B. To change the website's theme colors

C. To add new user roles

D. To organize content in a way that fits your website's needs

Solution

1. Step 1: Understand what taxonomy means in WordPress

   Taxonomies group content like categories or tags to organize posts.

2. Step 2: Identify the purpose of custom taxonomies

   Custom taxonomies let you create your own groups to better fit your content.

3. Final Answer:

   To organize content in a way that fits your website's needs -> Option D

4. Quick Check:

   Custom taxonomy = organize content [OK]

Hint: Custom taxonomies organize content, not change design or speed [OK]

Common Mistakes:

• Confusing taxonomies with themes or plugins
• Thinking taxonomies affect site speed
• Mixing taxonomies with user roles

2. Which of the following is the correct way to register a custom taxonomy called genre for posts in WordPress?

easy

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

B. register_taxonomy('genre', 'posts', array('hierarchical' => true));

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

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

Solution

1. Step 1: Check the function signature of register_taxonomy()

   The function requires taxonomy name, object type(s) as string or array, and an array of arguments.

2. Step 2: Verify correct parameter types and syntax

   register_taxonomy('genre', 'post', array('hierarchical' => true)); uses 'post' as string and an array for arguments correctly.

3. Final Answer:

   register_taxonomy('genre', 'post', array('hierarchical' => true)); -> Option A

4. Quick Check:

   Correct syntax uses array for args and string for post type [OK]

Hint: Use array() for args and string or array for post types [OK]

Common Mistakes:

• Using plural 'posts' instead of 'post'
• Passing arguments outside an array
• Wrong parameter order

3. Given this code snippet:

register_taxonomy('genre', 'post', array('hierarchical' => true));
$terms = get_terms(array('taxonomy' => 'genre', 'hide_empty' => false));
foreach ($terms as $term) {
  echo $term->name . ', ';
}

What will this code output if there are two terms 'Fiction' and 'Non-Fiction' assigned to posts?

medium

A. genre, Fiction, Non-Fiction

B. Fiction, Non-Fiction,

C. Array

D. Error: Undefined variable

Solution

1. Step 1: Understand get_terms() usage

   get_terms() fetches terms of the taxonomy 'genre' including empty ones due to 'hide_empty' => false.

2. Step 2: Loop through terms and print their names

   The foreach loop prints each term's name followed by a comma and space.

3. Final Answer:

   Fiction, Non-Fiction, -> Option B

4. Quick Check:

   Loop prints term names separated by commas [OK]

Hint: get_terms returns term objects; loop prints their names [OK]

Common Mistakes:

• Expecting taxonomy name instead of term names
• Confusing array output with string
• Not setting 'hide_empty' causing missing terms

4. What is wrong with this code snippet for registering a custom taxonomy?

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

medium

A. The post type should be an array, not a string

B. The taxonomy name must be plural

C. The third argument should be an array, not a key-value pair directly

D. The function name is incorrect

Solution

1. Step 1: Check the function parameters

   register_taxonomy() expects the third argument as an array of arguments.

2. Step 2: Identify the error in argument format

   The code passes 'hierarchical' => true directly, not inside an array, causing syntax error.

3. Final Answer:

   The third argument should be an array, not a key-value pair directly -> Option C

4. Quick Check:

   Args must be in array() [OK]

Hint: Always wrap arguments in array() for register_taxonomy [OK]

Common Mistakes:

• Passing arguments without array()
• Using plural taxonomy names incorrectly
• Wrong function name like register_taxonomies

5. You want to create a custom taxonomy called location that behaves like tags (non-hierarchical) and attach it to both post and event post types. Which code snippet correctly achieves this?

hard

A. register_taxonomy('location', array('post', 'event'), array('hierarchical' => false));

B. register_taxonomy('location', 'post', array('hierarchical' => false)); register_taxonomy('location', 'event', array('hierarchical' => false));

C. register_taxonomy('location', array('post', 'event'), array('hierarchical' => true));

D. register_taxonomy('location', array('post', 'event'), array('hierarchical' => true, 'tags' => true));

Solution

1. Step 1: Understand hierarchical argument for tags

   Tags are non-hierarchical, so 'hierarchical' must be false.

2. Step 2: Attach taxonomy to multiple post types

   Pass an array of post types ['post', 'event'] as second argument.

3. Step 3: Check options for correct syntax and behavior

   register_taxonomy('location', array('post', 'event'), array('hierarchical' => false)); correctly sets 'hierarchical' => false and attaches to both post types in one call.

4. Final Answer:

   register_taxonomy('location', array('post', 'event'), array('hierarchical' => false)); -> Option A

5. Quick Check:

   Non-hierarchical + multiple post types = register_taxonomy('location', array('post', 'event'), array('hierarchical' => false)); [OK]

Hint: Use array for post types and set hierarchical false for tags [OK]

Common Mistakes:

• Setting hierarchical true for tags
• Calling register_taxonomy twice unnecessarily
• Passing post types as string instead of array