Prestashop easy customization

I have my [login to view URL] edited by previous developer, not available at the moment. I need you to edit this code by adding a check on the product (inside cart) ID. I tried myself, but did not succeed, don't understand why. Sure for a php programmer that knows prestashop it's a matter of minutes. Here is the code: //code added by amit chauhan $prod_arr = Context::getContext()->cart->getProducts(); $total=0; for($i=0;$i<count($prod_arr);$i++) { if(isset($prod_arr[$i]['reduction_applies']) && $prod_arr[$i]['reduction_applies']==1) { $pid=$prod_arr[$i]['id_product']; $sql_spprice = "SELECT reduction FROM "._DB_PREFIX_."specific_price where id_product=".$pid; $results_spprice = Db::getInstance()->ExecuteS($sql_spprice); if($results_spprice[0]['reduction']=="0.150000") { $total+=($prod_arr[$i]['price_wt']*$prod_arr[$i]['cart_quantity']); } else if (($results_spprice[0]['reduction']=="0.500000")) { $total+=0; } } else { $total+=($prod_arr[$i]['price_wt']*$prod_arr[$i]['cart_quantity']); } } $order_total = $total; //code ended by amit chauhan I need to add another check on the product ID. If ($prod_arr[$i]['id_product']==600513) {$total+=0;} Something like this.