add_action('save_post', function ($post_id) {
// Stop autosaves and revisions
if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) return;
if (wp_is_post_revision($post_id)) return;
// Only apply to standard posts
if (get_post_type($post_id) !== 'post') return;
$terms = wp_get_post_terms($post_id, 'category');
// If zero or one category, nothing to enforce
if (count($terms) <= 1) return;
// Prefer deepest category (child beats parent)
usort($terms, function ($a, $b) {
return $b->parent - $a->parent;
});
// Keep only one category
wp_set_post_terms(
$post_id,
array($terms[0]->term_id),
'category',
false
);
}, 20);
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