php - 计算表格上的字段内容

Question

我有这张表，如何从 PHP 脚本的 Count 列 (30+15+20) 中计算字段内容？
如果有人有片段、源代码或教程，请告诉我:)

foreach($row->result_array() as $row) {
   <td><div align="center"><?PHP echo $row['No']; ?></div></td>
   <td><div align="center"><?PHP echo $row['Count']; ?></div></td>
}

Answer 1

$count = 0;
foreach($row->result_array() as $row) {
    echo('<td><div align="center">'.$row['No'].'</div></td>
    <td><div align="center">'.$row['Count'].'</div></td>');
    $count += $row['Count']
}
echo 'total count is '.$count;

Answer 2

用值初始化一个变量0...而不是+=用来将值添加到您的$total

$total = 0;

foreach($row->result_array() as $row) {
   $total += $row['Count']; //Add this to your loop
   /* What we are doing here is adding the value of $row['Count'] to $total
      $total value will be available on each iteration and you keep on adding
      values of $row['Count']
   */
?>
   <td><div align="center"><?PHP echo $row['No']; ?></div></td>
   <td><div align="center"><?PHP echo $row['Count']; ?></div></td>
<?php 
}

echo $total;

或者，最可取的方法是SUM()在您的查询中使用