如何更新表格中的每一行值？

Question

我有一个包含多行的表格。我想更新每一行，直到我以先入先出（FIFO）顺序离开我的金额余额。示例表：

    id  value  balance
row  1   1000     1000
row  2   2000     2000
row  3   1500     1500
row  4   1000     1000

对于此表格，我得到2500（文本框$topcfcacc的值）。

现在我想支付第一行的全部值，因为它小于收到的金额。然后是第二行，直到我收到的金额为0。

$topcfcacc = $_POST['pcfc'];

$selectpcfc  = "SELECT * FROM `pcfc_disbursed` where status = 0 order by pcfc_disbursed_id asc";
$pcfc_result = mysqli_query($connection, $selectpcfc);
if (mysqli_num_rows($pcfc_result) > 0) 
{
    $num_rows = mysqli_num_rows($pcfc_result);

    for ($i=0;$i<$num_rows;$i++) 
    {
       $pcfcrows = mysqli_fetch_assoc($pcfc_result);
       $disbursed_id = $pcfcrows['pcfc_disbursed_id'];
       $disbursed   = $pcfcrows['disbursed_usd'];
       $usdbalance   = $pcfcrows['balance_usd'];
       $usdpaid      = $pcfcrows['paid_usd'];

       if($topcfcacc > $usdbalance)
       {
           $updatepcfc= "UPDATE `pcfc_disbursed` SET `balance_usd`=0,`paid_usd`=$usdbalance,`status`=1 WHERE pcfc_disbursed_id = $disbursed_id";
           $pcfc_update_result = mysqli_query($connection, $updatepcfc);
       }
       else
       {
           $updatepcfc= "UPDATE `pcfc_disbursed` SET 'balance_usd`=0,`paid_usd`=$usdbalance,`status`=1 WHERE pcfc_disbursed_id = $disbursed_id";
           $pcfc_update_result = mysqli_query($connection, $updatepcfc);
       }
    }
}