Relevanssi search categories

add_filter('relevanssi_hits_filter', 'relevanssi_read_categories');
function relevanssi_read_categories($hits) {
    global $relevanssi_search_categories;
    $temp_relevanssi_search_categories = array();
    foreach ($hits[0] as $hit) {
        $cats = get_the_category($hit->ID);
        foreach ($cats as $cat) {
            $temp_relevanssi_search_categories[$cat->name] = get_category_link($cat->term_id);
        }
    }

    ksort($temp_relevanssi_search_categories);
    $relevanssi_search_categories = array();
    foreach ($temp_relevanssi_search_categories as $name => $url) {
        $relevanssi_search_categories[] = "<a href='$url'>$name</a>";
    }
    return $hits;
}