function ean13_check_digit($digits) {
      //first change digits to a string so that we can access individual numbers
      $digits =(string)$digits;
      // 1. Add the values of the digits in the even-numbered positions: 2, 4, 6, etc.
      $even_sum = $digits{1} + $digits{3} + $digits{5} + $digits{7} + $digits{9} + $digits{11};
      // 2. Multiply this result by 3.
      $even_sum_three = $even_sum * 3;
      // 3. Add the values of the digits in the odd-numbered positions: 1, 3, 5, etc.
      $odd_sum = $digits{0} + $digits{2} + $digits{4} + $digits{6} + $digits{8} + $digits{10};
      // 4. Sum the results of steps 2 and 3.
      $total_sum = $even_sum_three + $odd_sum;
      // 5. The check character is the smallest number which, when added to the result in step 4,  produces a multiple of 10.
      $next_ten = (ceil($total_sum/10))*10;
      $check_digit = $next_ten - $total_sum;
      return $digits . $check_digit;
      }

$result = mysql_query('SELECT c.categoryid, title FROM serendipity_entries e INNER JOIN serendipity_entrycat c ON c.ent
while ($post = mysql_fetch_assoc($result)) {
// category mapping
        switch ($post['categoryid']) {
                case 3: $new_cat = 8; break;
                case 2: $new_cat = 11; break;
                case 12: $new_cat = 12; break;
                case 1: $new_cat = 9; break;
                case 16: $new_cat = 13; break;
        }
        $query = "SELECT  id FROM wp_posts WHERE post_title = '$post[title]'";
        $r2 = mysql_query($query, $wp);
        $row = mysql_fetch_row($r2);
        $wp_post_id = $row[0];
 
      mysql_query("UPDATE wp_term_relationships SET term_taxonomy_id=$new_cat WHERE object_id=$wp_post_id");
 
      mysql_query("UPDATE wp_term_taxonomy SET count = count - 1 WHERE term_taxonomy_id=1", $wp);
      mysql_query("UPDATE wp_term_taxonomy SET count = count + 1 WHERE term_taxonomy_id=$new_cat", $wp);
}

mysql_query('use neo', $mysql);
mysql_query('set names latin1', $mysql);
$result = mysql_query('SELECT
                               id, timestamp, authorid, last_modified, title,
                               body, extended, isdraft
                               FROM serendipity_entries', $mysql);
while ($post = mysql_fetch_assoc($result)) {
      $post['categories'] = $s9ydb->get_results('SELECT categoryid FROM '.$pre
      $posts[]=$post;
}