php 图片上传不适用于 php 8.1 的实时服务器，但适用于 8.0

Question

早些时候它在实时主机上运行良好，但现在我将我的 php 版本更新到 8.1 并停止工作。 但是当我在 xampp 本地服务器上检查它时它工作正常。

我的 HTML 代码是：-

      <form method="POST" id="name-form" enctype="multipart/form-data">
            <div class="h4">Update Display</div>
            <input type='file' name="dp" class="input-form" accept="image/*">
            <input type="submit" value="Update" name="dp" class="edit-button">
            </form>

和 php 是 :-

      function compressImage($source, $destination, $quality){
     $imgInfo = getimagesize($source);
     $dataMine = $imgInfo['mime'];

    switch ($dataMine) {
    case 'image/jpeg':
        $image = imagecreatefromjpeg($source);
        break;
    case 'image/png':
        $image = imagecreatefrompng($source);
        break;
    case 'image/jpg':
        $image = imagecreatefromjpeg($source);
        break;
    default:
        $image = imagecreatefromjpeg($source);
}

   imagejpeg($image, $destination, $quality);

   // final Return compressed image 
     return $destination;
    }
      if (isset($_POST['dp'])) {
      $filename = $_FILES["dp"]["name"];
      $tempname = $_FILES["dp"]["tmp_name"];
      $imgsize = $_FILES["dp"]["size"];
      $folder = "covers/" . time() . $filename;
      $fold = "covers/" . time() . $filename;
      $allowed = array('jpeg', 'png', 'jpg');
      $ext = pathinfo($folder, PATHINFO_EXTENSION);
        if (!in_array($ext, $allowed)) {
      $errors['DP'] = "Sorry, only JPG, JPEG, PNG  files are allowed.";
         }
      if ($imgsize > 3098152) {
      $errors['size'] = "File size must be less than 3MB";
      }
      if (count($errors) === 0) {
      $compressedImage = compressImage($tempname, $folder, 40);
      if ($compressedImage) {
      move_uploaded_file($compressedImage, $folder);

    $pd = ("update inst set cover = :folder where uid = :uid limit 1 ");
    $result_to_update_dp = $conn->prepare($pd);
    $result_to_update_dp->bindParam(':folder', $fold, PDO::PARAM_STR);
    $result_to_update_dp->bindParam(':uid', $uid, PDO::PARAM_STR);
    $dp_update = $result_to_update_dp->execute();
    if ($dp_update) {
        $_SESSION['success'] = "Profile Picture Updated Successfully. May Reflect After Some Time";
        $uploadDir = "covers/";
        //$_SERVER['DOCUMENT_ROOT']. 
        $uploadFile = $uploadDir . basename(time() . $filename);
        $uploadRequest = array(
            'fileName' => basename($uploadFile),
            'fileData' => base64_encode(file_get_contents($uploadFile))
        );
        header("location:index.php");
        exit();
        }
        }
     } else {
     $errors['upload'] = "OOps Something Wrong ! Try Again";
        }
       }

一直在说 警告： Undefined Array Key "Dp" In /Home/Myclass2/Public_html/User.Php On Line 403

警告： 尝试访问 /Home/Myclass2/Public_html/User.Php 中类型为 Null 的值的数组偏移 403

警告：/Home/Public_html/User.Php 404 行中未定义的数组键“Dp”

警告： 尝试访问 /Home/Myclass2/Public_html/User.Php 中类型为 Null 的值的数组偏移 404

警告：405 行 /Home/Public_html/User.Php 中未定义的数组键“Dp”

警告： 尝试在 /Home//Public_html/User.Php 405 行中访问空值类型的数组偏移量

但是本地主机运行良好。

提前致谢！

Answer 1

您可以尝试将

$_POST['dp']

的所有实例更改为

$_POST['Dp']

。错误信息，它显示的是大写字母“D”的“Dp”

if (isset($_POST['Dp'])) {
    // rest of the code
}