You want to display posts that belong to category ID 4 or category ID 7 using WP_Query. Which query parameter array will correctly achieve this?

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Wordpress - WordPress Query and Database

You want to display posts that belong to category ID 4 or category ID 7 using WP_Query. Which query parameter array will correctly achieve this?

Aarray('category_name' => '4,7')

Barray('cat' => '4,7')

Carray('category__in' => array(4, 7))

Darray('cat' => array(4, 7))

Step-by-Step Solution

Solution:

Step 1: Understand how to query multiple categories
To query posts in multiple categories by ID, use 'category__in' with an array of IDs.
Step 2: Evaluate each option
array('cat' => '4,7') uses a string with comma which is invalid for 'cat'. array('category_name' => '4,7') uses 'category_name' with numbers which expects slugs. array('cat' => array(4, 7)) uses 'cat' with an array which is invalid.
Final Answer:
array('category__in' => array(4, 7)) -> Option C
Quick Check:
Multiple category IDs use 'category__in' with array = A [OK]

Quick Trick: Use 'category__in' with array for multiple category IDs [OK]

Common Mistakes:

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