Question

我能够很好地上传图片，但是当我将图片/ jpg，image / gif更改为application / msword和application / pdf时，它不起作用。这是我的代码。完全相同的代码适用于图像，但是对于上传文档和pdf，它会输出“无效文件”。这里发生了什么？我的文件只有大约30kb，远低于文件大小限制。

$allowedExts = array("pdf", "doc", "docx"); 
$extension = end(explode(".", $_FILES["file"]["name"]));

if ( ( ($_FILES["file"]["type"] == "application/msword") || ($_FILES["file"]["type"] == "text/pdf") ) 
&& ($_FILES["file"]["size"] < 20000) && in_array($extension, $allowedExts))
{      
 move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $_FILES["file"]["name"]); 
}
else
{
echo "Invalid file."
}

Answer 1

请勿使用['type']参数来验证上传。该字段是用户提供的，可以简单地伪造，允许上传任何类型的文件。 ['name']参数也是如此 - 这是用户提供的文件名。伪造也是微不足道的，因此用户发送nastyvirus.exe并将其称为cutekittens.jpg。

验证上传的正确方法是使用服务器端mime类型确定，例如，通过fileinfo，加上正确的上传成功检查，您不需要：

if ($_FILES['file']['error'] !== UPLOAD_ERR_OK) {
    die("Upload failed with error " . $_FILES['file']['error']);
}
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mime = finfo_file($finfo, $_FILES['file']['tmp_name']);
$ok = false;
switch ($mime) {
   case 'image/jpeg':
   case 'application/pdf'
   case etc....
        $ok = true;
   default:
       die("Unknown/not permitted file type");
}
move_uploaded_file(...);

您还使用用户提供的文件名作为move_uploaded_files的最终目标的一部分。将路径数据嵌入到该文件名中也是微不足道的，然后您可以盲目地使用它。这意味着恶意远程用户可以在您的服务器上的任何文件上涂鸦，他们知道路径，以及工厂新文件。

Answer 2

请在代码中添加正确的mime-types - 至少包含以下内容：

.jpeg -> image/jpeg
.gif  -> image/gif
.png  -> image/png

可以找到mime类型列表here。

此外，简化代码的逻辑并报告错误编号，以帮助第一级支持追踪问题：

$allowedExts = array(
  "pdf", 
  "doc", 
  "docx"
); 

$allowedMimeTypes = array( 
  'application/msword',
  'text/pdf',
  'image/gif',
  'image/jpeg',
  'image/png'
);

$extension = end(explode(".", $_FILES["file"]["name"]));

if ( 20000 < $_FILES["file"]["size"]  ) {
  die( 'Please provide a smaller file [E/1].' );
}

if ( ! ( in_array($extension, $allowedExts ) ) ) {
  die('Please provide another file type [E/2].');
}

if ( in_array( $_FILES["file"]["type"], $allowedMimeTypes ) ) 
{      
 move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $_FILES["file"]["name"]); 
}
else
{
die('Please provide another file type [E/3].');
}

Answer 3

$folder = "Resume/";
$temp = explode(".", $_FILES["uploaded"]["name"]);
$newfilename = round(microtime(true)).'.'. end($temp);
$db_path ="$folder".$newfilename  ;
//remove the .
$listtype = array(
'.doc'=>'application/msword',
'.docx'=>'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
'.rtf'=>'application/rtf',
'.pdf'=>'application/pdf'); 
if ( is_uploaded_file( $_FILES['uploaded']['tmp_name'] ) )
{
if($key = array_search($_FILES['uploaded']['type'],$listtype))
{if (move_uploaded_file($_FILES['uploaded']  ['tmp_name'],"$folder".$newfilename))
{
include('connection.php');
$sql ="INSERT INTO tb_upload
(filePath) VALUES ('$db_path')";
}
}
else    
{
echo "File Type Should Be .Docx or .Pdf or .Rtf Or .Doc";
}

Answer 4

你的一个条件是失败。检查文件的mime-type值尝试使用application / pdf，而不是text / pdf。请参阅Proper MIME media type for PDF files

Answer 5

您可以使用

$_FILES['filename']['error'];

如果发生任何类型的错误，则返回错误＆＃39;否则1,2,3,4或1如果完成

1：如果文件大小超过限制....您可以通过Google搜索找到其他选项

Answer 6

    <?php

    //create table

    /*

    --
    -- Database: `mydb`
    --

    -- --------------------------------------------------------

    --
    -- Table structure for table `tbl_user_data`
    --

    CREATE TABLE `tbl_user_data` (
      `attachment_id` int(11) NOT NULL,
      `attachment` varchar(200) NOT NULL
    ) ENGINE=InnoDB DEFAULT CHARSET=latin1;

    --
    -- Indexes for dumped tables
    --

    --
    -- Indexes for table `tbl_user_data`
    --
    ALTER TABLE `tbl_user_data`
      ADD PRIMARY KEY (`attachment_id`);

    --
    -- AUTO_INCREMENT for dumped tables
    --

    --
    -- AUTO_INCREMENT for table `tbl_user_data`
    --
    ALTER TABLE `tbl_user_data`
      MODIFY `attachment_id` int(11) NOT NULL AUTO_INCREMENT;

      */
    $servername = "localhost";
    $username = "root";
    $password = "";
    // Create connection
    $dbname = "myDB";
    // Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);
    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    } 

    if(isset($_POST['submit'])){

      $fileName=$_FILES["resume"]["name"];
      $fileSize=$_FILES["resume"]["size"]/1024;
      $fileType=$_FILES["resume"]["type"];
      $fileTmpName=$_FILES["resume"]["tmp_name"];
      $statusMsg = '';
      $random=rand(1111,9999);
      $newFileName=$random.$fileName;

      //file upload path
      $targetDir = "resumeUpload/";
      $fileName = basename($_FILES["resume"]["name"]);
      $targetFilePath = $targetDir . $newFileName;
      $fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);

      if(!empty($_FILES["resume"]["name"])) {
          //allow certain file formats
          //$allowTypes = array('jpg','png','jpeg','gif','pdf','docx','doc');
          $allowTypes = array('pdf','docx','doc');
          if(in_array($fileType, $allowTypes)){
              //upload file to server
              if(move_uploaded_file($_FILES["resume"]["tmp_name"], $targetFilePath)){
                  $statusMsg = "The file ".$fileName. " has been uploaded.";
              }else{
                  $statusMsg = "Sorry, there was an error uploading your file.";
              }
          }else{
              $statusMsg = 'Sorry, only DOC,DOCX, & PDF files are allowed to upload.';
          }
      }else{
          $statusMsg = 'Please select a file to upload.';
      }

      //display status message
      echo $statusMsg;

      $sql="INSERT INTO `tbl_user_data` (`attachment_id`, `attachment`) VALUES
      ('NULL', '$newFileName')";

      if (mysqli_query($conn, $sql)) {

       $last_id = mysqli_insert_id($conn);
         echo "upload success";
      } else {
          echo "Error: " . $sql . "<br>" . mysqli_error($conn);
      }


    }

    ?>
    <form id="frm_upload" action="" method="post" enctype="multipart/form-data">
    Upload Resume:<input type="file" name="resume" id="resume">
    <button type="submit" name="submit">Apply  Now</button> 
    </form>

     //output sample[![check here for sample output][1]][1]

Answer 7

对于application / msword和application / vnd.ms-excel，当我删除了大小限制时：

($_FILES["file"]["size"] < 20000)

......它运作正常。

使用PHP上传DOC或PDF

7 个答案: