Query parameters in Wordpress - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

How does WP_Query handle multiple query parameters?

Consider the following WP_Query arguments:

array('post_type' => 'post', 'category_name' => 'news', 'posts_per_page' => 5)

What will be the result of this query?

A Returns posts of any type limited to 5 posts.

B Returns 5 posts from all categories ignoring 'category_name'.

C Returns the latest 5 posts from the 'news' category only.

D Returns all posts from the 'news' category ignoring 'posts_per_page'.

💡 Hint

Think about how WP_Query filters posts by category and limits the number of posts.

The query filters posts by the 'news' category and limits the results to 5 posts because 'posts_per_page' is set to 5.

📝 Syntax

intermediate

Identify the correct syntax for querying posts by meta key and value

Which of the following WP_Query arguments correctly queries posts where the meta key 'color' equals 'blue'?

A array('meta_query' => array('color' => 'blue'))

B array('meta_key' => 'color', 'meta_compare' => '=', 'meta_value' => 'blue')

C array('meta_key' => 'color', 'meta_value' => 'blue')

D array('meta_query' => array(array('key' => 'color', 'value' => 'blue')))

💡 Hint

WP_Query uses 'meta_query' as an array of conditions for meta filtering.

The correct way to query by meta key and value is using 'meta_query' with an array specifying 'key' and 'value'.

🔧 Debug

advanced

Why does this WP_Query return no posts?

Given this code:

$args = array('post_type' => 'product', 'category_name' => 'electronics');
$query = new WP_Query($args);

Why might this query return no posts even if products exist in the 'electronics' category?

A Because 'post_type' should be 'products' plural to match the taxonomy.

B Because 'category_name' only works with the 'post' post type, not 'product'.

C Because 'category_name' requires a taxonomy parameter to be set explicitly.

D Because WP_Query does not support filtering by category.

💡 Hint

Think about default taxonomies and custom post types.

'category_name' filters the default 'category' taxonomy which is linked only to the 'post' post type. Custom post types like 'product' usually use custom taxonomies.

🧠 Conceptual

advanced

How does 'paged' parameter affect WP_Query results?

If you set 'posts_per_page' to 3 and 'paged' to 2 in WP_Query arguments, what will the query return?

A The first 3 posts from the second page of results (posts 4 to 6).

B The first 6 posts from the first page.

C All posts ignoring pagination.

D An error because 'paged' cannot be used with 'posts_per_page'.

💡 Hint

Consider how pagination works in WordPress queries.

'paged' specifies the page number of results. With 'posts_per_page' set to 3 and 'paged' to 2, the query returns posts 4 to 6.

❓ state_output

expert

What is the value of $query->found_posts after this WP_Query?

Given the code:

$args = array('post_type' => 'post', 'posts_per_page' => 2, 'category_name' => 'news');
$query = new WP_Query($args);
echo $query->found_posts;

Assuming there are 7 posts in the 'news' category, what will be output?

A 7

B 2

C 5

D 0

💡 Hint

Look up what 'found_posts' property represents in WP_Query.

'found_posts' holds the total number of posts matching the query ignoring pagination limits.