Taxonomy term management in Wordpress - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a taxonomy term in WordPress?

A taxonomy term is a label or category used to group content in WordPress. For example, tags or categories are taxonomies, and their individual items like 'News' or 'Sports' are terms.

beginner

Which WordPress function is used to create a new taxonomy term?

The function wp_insert_term() is used to add a new term to a taxonomy in WordPress.

beginner

How do you retrieve all terms of a taxonomy in WordPress?

Use the function get_terms() with the taxonomy name to get all terms in that taxonomy.

intermediate

What is the purpose of wp_set_object_terms()?

It assigns one or more terms to a specific post or object, linking content to taxonomy terms.

intermediate

How can you update a taxonomy term's name or slug?

Use wp_update_term() with the term ID and an array of new values like 'name' or 'slug'.

Which function adds a new term to a taxonomy in WordPress?

A wp_insert_term()

B get_terms()

C wp_set_object_terms()

D wp_update_term()

wp_insert_term() is used to create new terms.

What does get_terms() return?

A All posts in a taxonomy

B All users assigned to a term

C All terms in a taxonomy

D All taxonomies registered

get_terms() returns all terms of a specified taxonomy.

Which function assigns terms to a post?

A get_terms()

B wp_set_object_terms()

C wp_insert_term()

D wp_update_term()

wp_set_object_terms() links terms to posts or objects.

To change a term's name, which function should you use?

A wp_update_term()

B wp_insert_term()

C get_terms()

D wp_delete_term()

wp_update_term() updates term details like name or slug.

What is a taxonomy in WordPress?

A A type of post

B A theme feature

C A plugin

D A way to group content

Taxonomies group content by categories or tags.

Explain how to add and assign a new taxonomy term to a post in WordPress.

Think about creating the label first, then linking it to content.

Describe how to retrieve and update taxonomy terms in WordPress.

One function fetches terms, the other changes them.

Practice

1. What is the primary purpose of taxonomy terms in WordPress?

easy

A. To handle database backups automatically

B. To create user accounts and manage permissions

C. To store theme settings and customization options

D. To group and organize content for easier filtering and display

Solution

1. Step 1: Understand taxonomy terms role

   Taxonomy terms are used to group content like posts or custom post types for better organization.

2. Step 2: Compare with other options

   User accounts, theme settings, and backups are unrelated to taxonomy terms.

3. Final Answer:

   To group and organize content for easier filtering and display -> Option D

4. Quick Check:

   Taxonomy terms = content grouping [OK]

Hint: Taxonomy terms group content, not users or settings [OK]

Common Mistakes:

• Confusing taxonomy terms with user roles
• Thinking taxonomy terms manage theme options
• Assuming taxonomy terms handle backups

2. Which of the following is the correct way to insert a new taxonomy term in WordPress?

easy

A. wp_insert_term('Term Name', 'taxonomy_name');

B. insert_term('Term Name', 'taxonomy_name');

C. add_term('Term Name', 'taxonomy_name');

D. create_term('Term Name', 'taxonomy_name');

Solution

1. Step 1: Identify the correct function name

   The official WordPress function to add a taxonomy term is wp_insert_term().

2. Step 2: Check function parameters

   The function takes the term name and taxonomy slug as parameters, matching wp_insert_term('Term Name', 'taxonomy_name');.

3. Final Answer:

   wp_insert_term('Term Name', 'taxonomy_name'); -> Option A

4. Quick Check:

   Insert term function = wp_insert_term() [OK]

Hint: Remember the prefix 'wp_' for WordPress core functions [OK]

Common Mistakes:

• Using non-existent functions like insert_term
• Omitting the 'wp_' prefix
• Confusing with functions for posts or users

3. What will the following code output if the taxonomy 'genre' has terms 'Fiction' and 'Non-Fiction'?

 $terms = get_terms(['taxonomy' => 'genre', 'hide_empty' => false]);
foreach ($terms as $term) {
    echo $term->name . ', ';
}

medium

A. Array, Array,

B. genre, Fiction, Non-Fiction,

C. Fiction, Non-Fiction,

D. Error: Undefined variable

Solution

1. Step 1: Understand get_terms() output

   The function returns an array of term objects for the 'genre' taxonomy, including 'Fiction' and 'Non-Fiction'.

2. Step 2: Loop and echo term names

   The foreach loop prints each term's name followed by a comma and space, resulting in 'Fiction, Non-Fiction, '.

3. Final Answer:

   Fiction, Non-Fiction, -> Option C

4. Quick Check:

   get_terms() returns term objects with names [OK]

Hint: get_terms() returns objects; access name with ->name [OK]

Common Mistakes:

• Expecting taxonomy name instead of term names
• Trying to print array directly
• Forgetting to set 'hide_empty' to false to get all terms

4. Identify the error in this code snippet for updating a taxonomy term name:

 wp_update_term(123, 'category', ['name' => 'New Name']); 

medium

A. The taxonomy slug 'category' is incorrect for terms

B. No error; this code correctly updates the term name

C. Term ID must be a string, not an integer

D. The third parameter should be a string, not an array

Solution

1. Step 1: Check wp_update_term() parameters

   The function takes term ID (integer), taxonomy slug (string), and an array of args to update.

2. Step 2: Verify usage correctness

   Using term ID 123, taxonomy 'category', and array with 'name' key is correct syntax and usage.

3. Final Answer:

   No error; this code correctly updates the term name -> Option B

4. Quick Check:

   wp_update_term() usage = correct [OK]

Hint: wp_update_term() needs term ID, taxonomy, and args array [OK]

Common Mistakes:

• Passing term ID as string instead of integer
• Using wrong parameter types
• Confusing taxonomy slug with term name

5. You want to add a new term 'Adventure' to the custom taxonomy 'book_genre' only if it does not already exist. Which code snippet correctly achieves this?

hard

A. if (!term_exists('Adventure', 'book_genre')) { wp_insert_term('Adventure', 'book_genre'); }

B. wp_insert_term('Adventure', 'book_genre');

C. if (term_exists('Adventure')) { wp_insert_term('Adventure', 'book_genre'); }

D. wp_update_term('Adventure', 'book_genre');

Solution

1. Step 1: Check if term exists in taxonomy

   Use term_exists('Adventure', 'book_genre') to verify if the term is already present.

2. Step 2: Insert term only if it does not exist

   If the term does not exist (negation), call wp_insert_term('Adventure', 'book_genre') to add it.

3. Final Answer:

   if (!term_exists('Adventure', 'book_genre')) { wp_insert_term('Adventure', 'book_genre'); } -> Option A

4. Quick Check:

   Check existence before insert = safe add [OK]

Hint: Use term_exists() before wp_insert_term() to avoid duplicates [OK]

Common Mistakes:

• Inserting term without checking existence
• Using term_exists() without taxonomy parameter
• Using wp_update_term() to add new term