The clean_category_cache() WordPress PHP function is used to remove the category cache data based on a specific ID.
Usage
To use the clean_category_cache() function, you simply need to pass in the ID of the category you want to clear from the cache.
clean_category_cache(15);
In this example, the cache for the category with the ID of 15 is cleared.
Parameters
$id(int) – The ID of the category you wish to clear from the cache.
More information
See WordPress Developer Resources: clean_category_cache
This function was implemented in WordPress 3.1.0. It has not been deprecated as of the latest WordPress version. The source code for this function is located in wp-includes/category.php.
Examples
Clearing a Category Cache
This example clears the cache for category 12.
clean_category_cache(12);
Clearing Multiple Category Caches
This example demonstrates how to clear the cache for multiple categories using an array of IDs.
$categories = array(1, 2, 3, 4, 5);
foreach ($categories as $category_id) {
clean_category_cache($category_id);
}
Clearing Cache after Creating a Category
This example creates a new category and then immediately clears the cache.
$category_id = wp_create_category('New Category');
clean_category_cache($category_id);
Clearing Cache after Updating a Category
This example shows how to clear the cache after updating a category.
wp_update_category(array('cat_ID' => 2, 'category_nicename' => 'updated-category'));
clean_category_cache(2);
Clearing Cache after Deleting a Category
This example shows how to clear the cache after deleting a category.
wp_delete_category(3); clean_category_cache(3);
In each of these examples, the clean_category_cache() function is used to clear the cache for specific category IDs. This helps to ensure that the most up-to-date category data is used in your WordPress site.