Как вывести сумму дополнительного поля?

<?php
/*
Автор : Gameer 
-----------------------------------------------------
URL: http://gameer.name/
*/
if( ! defined( 'DATALIFEENGINE' ) ) return;
if($dle_module == "cat")
{
    $field = $db->safesql(trim(strip_tags(stripslashes($field))));
    $count_xfield = dle_cache('news_c_xf_' . $category_id . $field, $config['skin']);
    if(!$count_xfield)
    {
        $count_xfield = $db->super_query("SELECT SUM(SUBSTRING_INDEX( SUBSTRING_INDEX( xfields,  '{$field}|', -1 ) ,  '||', 1 )) as count FROM " . PREFIX . "_post WHERE SUBSTRING_INDEX( SUBSTRING_INDEX( xfields,  '{$field}|', -1 ) ,  '||', 1 ) != '' AND approve='1' AND category REGEXP '[[:<:]]({$category_id})[[:>:]]'");
        $res = $count_xfield['count'];
        echo $res;
        create_cache('news_c_xf_' . $category_id . $field, $res, $config['skin']);
    }
    else echo $count_xfield;
}

{include file="/engine/modules/countf.php?field=test"}

$res = $count_xfield['count'];

$res = round($count_xfield['count'], 2);