Filters the category that gets used in the %category% permalink token.

$cat WP_Term

The category to use in the permalink.

$cats array

Array of all categories (WP_Term objects) associated with the post.

$post WP_Post

The post in question.

File: wp-includes/link-template.php. View all references

$category_object = apply_filters( 'post_link_category', $cats[0], $cats, $post );