如何使用PHP和Mysql数据库下载文件

我是新来的，我真的被困在如何下载一个文件，我已经设法上传到我的本地服务器

我上传的脚本是-

require_once ('dbcon.php');

if(isset($_POST['log'])){
foreach($_FILES['files']['tmp_name'] as $key => $name_tmp){
        $file = $_FILES['files']['name'][$key];
        $tmpnm = $_FILES['files']['tmp_name'][$key];
        $type = $_FILES['files']['type'][$key];
        $size = $_FILES['files']['size'][$key];
        $dir = "file/".$file;
        $move = move_uploaded_file($tmpnm, $dir);
if ($move){             

            $query = ("INSERT into dfile VALUES(null,'$file','$type','$size')");
            $result = $dbLink->query($query);

            if($result){
                echo "<h4>Upload Complete</h4></br>";

            }else{
                echo "Error Table DB";

            }

        }
 }

}

require_once（'dbcon.php'）；
如果（isset（$_POST['log']））{
foreach（$\u FILES['FILES']['tmp\u name']作为$key=>$name\u tmp）{
$file=$_文件['FILES']['name'][$key]；
$tmpnm=$\u文件['FILES']['tmp\u名称][$key]；
$type=$_文件['FILES']['type'][$key]；
$size=$_文件['FILES']['size'][$key]；
$dir=“file/”$file；
$move=移动上传的文件（$tmpnm，$dir）；
如果（$移动）{
$query=（“插入到数据文件值中（null、$file'、$type'、$size'）；
$result=$dbLink->query（$query）；
如果（$结果）{
echo“上传完成”
；
}否则{
echo“错误表DB”；
}
}
}
}

您可以通过设置标题来执行此操作：

<?php

$file = $_GET['file'];
$dir = '';

if(isset($_GET['file']) && file_exists($dir . $file)) {
    $finfo = new finfo(FILEINFO_MIME_TYPE);
    $type = $finfo->file($file); // get MIME-Type
    header("Content-Type: " . $type);
    header("Content-Disposition: attachment; filename=\"" . $file . "\"");
    readfile($dir . $file);
}

---

路径取决于脚本的结构，但基本上如下所示：

while($row = $result->fetch_assoc()) { 
  echo " <tr> 
  <td>{$row['comp']}</td> 
  <td>{$row['expire']}</td> 
  <td>{$row['file']}</td> 
  <td>{$row['size']}</td>
  <td>
    <a download href=\"file/{$row['file']}\">Download this file</a>
  </td>
  </tr>";
}

while（$row=$result->fetch_assoc（））{
回声“
{$row['comp']}
{$row['expire']}
{$row['file']}
{$row['size']}
";
}

SomePage.php

<a href="download.php?FileNo=<?echo $FileNo;?>">File Name</a>

$FileNo=$_GET['FileNO'];

//Use Mysql Query to find the 'full path' of file using $FileNo.
// I Assume $FilePaths as 'Full File Path'.

download_file($FilePaths);

function download_file( $fullPath )
{
  if( headers_sent() )
    die('Headers Sent');


  if(ini_get('zlib.output_compression'))
    ini_set('zlib.output_compression', 'Off');


  if( file_exists($fullPath) )
  {

    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);

    switch ($ext) 
    {
      case "pdf": $ctype="application/pdf"; break;
      case "exe": $ctype="application/octet-stream"; break;
      case "zip": $ctype="application/zip"; break;
      case "doc": $ctype="application/msword"; break;
      case "xls": $ctype="application/vnd.ms-excel"; break;
      case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
      case "gif": $ctype="image/gif"; break;
      case "png": $ctype="image/png"; break;
      case "jpeg":
      case "jpg": $ctype="image/jpg"; break;
      default: $ctype="application/force-download";
    }

    header("Pragma: public"); 
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Cache-Control: private",false); 
    header("Content-Type: $ctype");
    header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: ".$fsize);
    ob_clean();
    flush();
    readfile( $fullPath );

  } 
  else
    die('File Not Found');

}

---

保存上传文件的路径如何？我如何设置，以便单击链接下载特定文件？我目前显示的结果上传文件如下。而（$row=$result->fetch_assoc（））{echo“{$row['comp']}{$row['expire']}{$row['file']}{$row['size']}//下载文件链接”；}且内容类型为MIME类型。我已经编辑了我的答案。这个代码不是完全安全的，但我想它会满足你的需要。这真是一个血腥的待遇。非常感谢你。头号人物：DNo问题。如果您喜欢，请检查我的答案：-）

$FileNo=$_GET['FileNO'];

//Use Mysql Query to find the 'full path' of file using $FileNo.
// I Assume $FilePaths as 'Full File Path'.

download_file($FilePaths);

function download_file( $fullPath )
{
  if( headers_sent() )
    die('Headers Sent');


  if(ini_get('zlib.output_compression'))
    ini_set('zlib.output_compression', 'Off');


  if( file_exists($fullPath) )
  {

    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);

    switch ($ext) 
    {
      case "pdf": $ctype="application/pdf"; break;
      case "exe": $ctype="application/octet-stream"; break;
      case "zip": $ctype="application/zip"; break;
      case "doc": $ctype="application/msword"; break;
      case "xls": $ctype="application/vnd.ms-excel"; break;
      case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
      case "gif": $ctype="image/gif"; break;
      case "png": $ctype="image/png"; break;
      case "jpeg":
      case "jpg": $ctype="image/jpg"; break;
      default: $ctype="application/force-download";
    }

    header("Pragma: public"); 
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Cache-Control: private",false); 
    header("Content-Type: $ctype");
    header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: ".$fsize);
    ob_clean();
    flush();
    readfile( $fullPath );

  } 
  else
    die('File Not Found');

}