When you remove vote check for your condition, then if needed:
- fetch categories with
wp_get_object_terms()(low level func, you can specify to fetch names or ids only since you don’t need full objects for this) - modify array (remove category you don’t need, add the one you do)
- set categories with
wp_set_post_categories()(it will overwrite all categories so those you remove from array will be gone)
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