如何通过foreach循环发送多个fileds值？

Question

如何通过使用相同的ID通过foreach循环发送多个字段值？

此HTML代码有什么问题？

<input type="text" size="3" name="new_quantity[<?php echo $product_id; ?>]" value="<?php echo $product_quantity; ?>" /> 
<input type="text" name="totalcost[<?php echo $product_id; ?>]" value="<?php $total_cost; ?>" /> 

现在PHP代码

foreach($_REQUEST['new_quantity'] as $key => $quantity) { 
    foreach($_REQUEST['totalcost'] as $key => $total) { 
     $sql=mysql_query("UPDATE `categories`.`carts` SET `product_quantity` = '$quantity',    `product_totalcost` = '$total' WHERE `carts`.`product_id` ='$key' AND cart_session='$sessionID'"); 
    } 
} 

Answer 1

循环回路内会给你N * N次更新查询

但你确实需要更新查询n次

这样做像这样：

$pids  = array_keys($_REQUEST['new_quantity']); /// here you will get all product_ids 

for($i=0; $i<count($_REQUEST['new_quantity']);$i++){ 
    echo $_REQUEST['new_quantity'][$pids[$i]]; // this quantity 
    echo $_REQUEST['totalcost'][$pids[$i]]; // total cost 
    echo $pids[$i]; // product id 

    /// add your update query here all details you need in query are echoed above. 
} 

Answer 2

尝试做一件事做一个数组量，一个用于成本

像

$qt=array(); 
foreach($_REQUEST['new_quantity'] as $key => $quantity) { 
$qt[].=$quantity; 
} 

$ct=array(); 
foreach($_REQUEST['totalcost'] as $key => $total) { 
$ct[].=$total; 
} 

随后击发更新查询在for循环