Как вывести характеристики в каталоге?

<?
    class shopAdd
    {
        public static function GetCode($code) 
        {
            $feature_model = new shopFeatureModel();
            $code = $feature_model->getByField('code', $code);
            return $code['name'];
        }
    }

{if $p.features} 
        <ul class="product-features">
        {foreach $p.features as $f_code => $f_value}
            <li>
                <b>{shopAdd::GetCode({$f_code})}</b> {if is_array($f_value)}{implode(', ', $f_value)}{else}{$f_value}{/if}</span>
            </li>
       {/foreach}
        </ul>
    {/if}