php - $_POST 如何将输入变量作为整数而不是 1 传递给 MySQL 查询？

Question

我有一个数字表，用户应该能够在其中编辑值并在提交时更新数据库。

到目前为止，我的错误代码在提交时将每个字段更新为值 1，无论输入了什么。

提交代码:

    //If the confirm button has been hit:
if (isset($_POST['submit'])) {

//Create the foreach loop
foreach($_POST['classtoupdate'] as $classes){

  //Grab the POST data and turn it into integers
    $class_id = (int)$classes; 
    $totalspcs = (int)$_POST['allspaces']; 
    $totalbkgs = (int)$_POST['allbookings']; 
    $newbies = (int)$_POST['noobs'];

//Change the booking numbers:
  $newdeets = "UPDATE classes SET total_spaces = '$totalspcs', total_bookings = '$totalbkgs', free_spaces = ('$totalspcs' - '$totalbkgs'), newbies = '$newbies' WHERE class_id = '$class_id')";
  echo $newdeets;
  mysqli_query($dbc, $newdeets);
}
  mysqli_close($dbc);
  echo 'All good, yay! <a href="admin.php">Go look</a>';

}

表格:

//create the form
echo '<form method="post" action="' . $_SERVER['PHP_SELF'] . '" >';

      echo '<tr><td>' . $class . '</td>';
      echo'<td>' . $new_date . '</td>';
      echo '<td>' . $new_time . '</td>';
      echo '<td><input type="text" maxlength="2" class="input-mini" name="noobs[]" id="noobs[]" value="' . $newbies . '">';
      echo '<td><input type="text" maxlength="2" class="input-mini" name="allspaces[]" id="allspaces[]" value="' . $totalspaces . '">';
      echo '<td><input type="text" maxlength="2" class="input-mini" name="allbookings[]" id="allbookings[]" value="' . $bookings . '"
>';
      echo '<td>' . $freespaces . '</td>';
      echo' <input type="hidden" name="classtoupdate[]" id="classtoupdate[]" value="' . $class . '" />';
    }
    echo'</table>';
    // Make booking button
      echo '<input type="submit" name="submit" class="btn btn-large btn-primary pull-right" value="Update">';
      echo '</form>';

在表单中输入随机值(非1)后回显的查询结果:

UPDATE classes SET total_spaces = '1', total_bookings = '1', free_spaces = ('1' - '1'), newbies = '1' WHERE class_id = '26')
UPDATE classes SET total_spaces = '1', total_bookings = '1', free_spaces = ('1' - '1'), newbies = '1' WHERE class_id = '16')

..对于每个表行依此类推。在对 SO 和手册进行广泛搜索后，我找不到重复的问题。

我在 POST 结果上尝试了 intval()、serialize 和 array_map(可能是错误的)；我尝试了不同的 foreach 循环将它们转换为整数，但仍然没有乐趣。

有什么建议吗？

Answer 1

试试这个:

foreach($_POST['classtoupdate'] as $index => $classes){

和

$totalspcs = (int)$_POST['allspaces'][$index]; 
$totalbkgs = (int)$_POST['allbookings'][$index]; 
$newbies = (int)$_POST['noobs'][$index];

注意每行中的$index。