循环mysqli更新，变量在while循环中增加1

Question

我正在尝试循环此代码，因为这将是动态生成的。它从mysql获取行数并循环多次。 POST 来自 ajax，它也是循环的，并且运行良好。在 php 部分，我不确定为什么它不起作用。我尝试了很多不同的循环变体。

$queryEle = "SELECT * FROM featureSheetContent WHERE `user_id` = '$userID' AND `feature_id` = '$featureID'";
  $resultEle = mysqli_query($connect,$queryEle);
  $rowEle = mysqli_num_rows($resultEle);

  $i = 1;

  while ($i < $rowEle) {
    $eleID.$i = $_POST['eleID'.$i];
    $eleID .= $eleID.$i;
    $resizeWidth.$i = $_POST['resizeWidth'.$i];
    $resizeWidth .= $eleID.$i;
    $resizeHeight.$i = $_POST['resizeHeight'.$i];
    $resizeHeight .= $eleID.$i;

    $UploadMain = $connect->prepare("UPDATE featureSheetContent SET `ele_width` = ?, `ele_height` = ? WHERE id = ?");
    $UploadMain->bind_param('sss', $resizeWidth, $resizeHeight, $eleID);
    $UploadMain->execute();

    $i++;
  }

未循环的代码有效：

  $eleID1 = $_POST['eleID1'];
  $resizeWidth1 = $_POST['resizeWidth1'];
  $resizeHeight1 = $_POST['resizeHeight1'];
  $eleID2 = $_POST['eleID2'];
  $resizeWidth2 = $_POST['resizeWidth2'];
  $resizeHeight2 = $_POST['resizeHeight2'];

  
  $UploadMain = $connect->prepare("UPDATE featureSheetContent SET `ele_width` = ?, `ele_height` = ? WHERE id = ?");
  $UploadMain->bind_param('sss', $resizeWidth1, $resizeHeight1, $eleID1);
  $UploadMain->execute();
  $UploadMain = $connect->prepare("UPDATE featureSheetContent SET `ele_width` = ?, `ele_height` = ? WHERE id = ?");
  $UploadMain->bind_param('sss', $resizeWidth2, $resizeHeight2, $eleID2);
  $UploadMain->execute();

Answer 1

变量变量的语法错误；正确的语法是${"eleID".$i}。但是每次循环都不需要使用不同的变量。将UPDATE 查询绑定到一组特定的变量，并从POST 变量中重新分配这些变量。

$eleID = $resizeWidth = $resizeHeight = null; // Create the variables before binding
$UploadMain = $connect->prepare("UPDATE featureSheetContent SET `ele_width` = ?, `ele_height` = ? WHERE id = ?");
$UploadMain->bind_param('sss', $resizeWidth, $resizeHeight, $eleID);

for ($i = 1; $i <= $rowEle; $i++) {
    $eleID = $_POST['eleID'.$i];
    $resizeWidth = $_POST['resizeWidth'.$i];
    $resizeHeight = $_POST['resizeHeight'.$i];
    $UploadMain->execute();
}

顺便说一句，您的UPDATE 查询将为任何用户更新一行，而不仅仅是user_id = '$userID'。这是故意的吗？