multi column sorted fulltext search

multi_coloumn_search.php

    public static function search_contacts($terms)
    {
        $terms = escape($terms);
        $contacts = Contact::where_account_user_id(Auth::user()->account_user_id)
            ->raw_where("match (`first`, `last`) against ('{$terms}*' IN BOOLEAN MODE)", array())
            ->where_account_user_id(Auth::user()->account_user_id)
            ->where_deleted(0)
            ->take(20)
            ->get();

        $contacts_array = array();
        foreach ($contacts as $contact) {
            $contacts_array[] = array_merge(
                $contact->to_array(),
                array('rank' => similar_text($terms, $contact->first . ' ' . $contact->last))
            );
        }

        aasort($contacts_array, 'rank');

        return array_reverse($contacts_array);
    }