如何在循环时获取列的总和？

Question

我有一个 table 在 MySQLi 获取数组时使用：

C1	C2	C3	C4	Total
$vsc1	$vsc2	$vsc3	$vsc4	$totalvsc // 6.662
$vsc1	$vsc2	$vsc3	$vsc4	$totalvsc // 6.916
$vsc1	$vsc2	$vsc3	$vsc4	$totalvsc // 7.15
$vsc1	$vsc2	$vsc3	$vsc4	$totalvsc // 6.107
--	--	--	Total Vektor S	sum of $totalvsc ($totvs) // 6.66213.57820.72826.835

我想从每一行中获取 $totalvsc 的总和 ($totvs)

代码的结果是6.66213.57820.72826.835.
结果应该不是这个，而是26.835.

我已经试过了，但是没有用。这是代码：

<tr>
   <th colspan="7">Total Vektor S</th>
      <td>
         <?php
            $totvs = 0;
            $sql2 = mysqli_query($koneksi,"select * from tb_alternatif");
            while ($hasil1 = mysqli_fetch_array($sql2))
            {
               $vsc1 = number_format(pow((int)$hasil1[2],$nb1),3);
               $vsc2 = number_format(pow((int)$hasil1[3],-$nb2),3);
               $vsc3 = number_format(pow((int)$hasil1[4],$nb3),3);
               $vsc4 = number_format(pow((int)$hasil1[5],-$nb4),3);
               $totalvs = $vsc1 + $vsc2 + $vsc3 + $vsc4;
               $totvs += $totalvs;
               echo $totvs; 
            }
       ?>
   </td>
</tr>

谁能帮帮我？

Answer 1

您应该将 echo 放在 while 循环之外，您当前的代码在每个循环周期中打印总变量的累积，这就是输出奇怪的原因。

<tr>
   <th colspan="7">Total Vektor S</th>
      <td>
         <?php
            $totvs = 0;
            $sql2 = mysqli_query($koneksi,"select * from tb_alternatif");
            while ($hasil1 = mysqli_fetch_array($sql2))
            {
               $vsc1 = number_format(pow((int)$hasil1[2],$nb1),3);
               $vsc2 = number_format(pow((int)$hasil1[3],-$nb2),3);
               $vsc3 = number_format(pow((int)$hasil1[4],$nb3),3);
               $vsc4 = number_format(pow((int)$hasil1[5],-$nb4),3);
               $totalvs = $vsc1 + $vsc2 + $vsc3 + $vsc4;
               $totvs += $totalvs;
            }
            echo $totvs;
       ?>
   </td>
</tr>

如何在循环时获取列的总和？

How to get the sum of a column in while looping?

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