变量（$ product.id_product）不会传递给函数:(（Prestahop）

{mycat id_product_my=$product.id_product}

{$product.id_product}

{mycat id_product_my=15}

function smarty_compiler_mycat($params, &$smarty) {

    $id_product_my = $params[‘id_product_my’];

    $ret = “”;

    if ($row = Db::getInstance(PS_USE_SQL_SLAVE)->ExecuteS(’
        SELECT cl.`name` FROM `’.DB_PREFIX.‘category_lang` cl 
        LEFT JOIN `’.DB_PREFIX.‘category_product` cp ON cl.`id_category` = cp.`id_category` 
        WHERE cp.`id_product` = ‘.(int)$id_product_my) )
            foreach ($row as $val) {
                $ret .= $val[‘name’].” “;
            }

    return $ret;
}