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    php 文件下载下来后文件打不开？解决思路

    2016-06-13 10:00:00原创1370

    php 文件下载下来后文件打不开？
    文件上传代码:
    $page_title='上传文件';
    include('include/header.inc');
    $counter=3; //Number files of allow upload.
    if(isset($_POST['submitted'])){ //hidden form
    require_once ('/conn.php'); // Connect to the database.
    for($i=0;$i<$counter;$i++){ //处理每一个上传的文件.
    $filename='upload'.$i; //
    $description='description'.$i;
    //check for file.
    if(isset($_FILES[$filename])&&($_FILES[$filename]['error'] !=4)){
    //check discription
    if(!empty($_POST[$description])){
    $d=trim($_POST[$description]);
    }else{
    $d=NULL;
    }
    //添加一条记录到数据库
    $query="INSERT INTO uploads (file_name,file_size,file_type,description) VALUES ('{$_FILES[$filename]['name']}','{$_FILES[$filename]['size']}',
    '{$_FILES[$filename]['type']}','$d') ";
    [email protected]_query($query);
    if($result){
    $upload_id=mysql_insert_id();
    // 将上传的文件移动到新位置
    if(move_uploaded_file($_FILES[$filename]['tmp_name'],"uploads/$upload_id")){
    echo '有'.($i+1).'条文件已经上传';
    }else{
    echo '有'.($i+1).'条文件上传失败';
    $query="DELETE FROM uploads WHERE upload_id=$upload_id";
    [email protected]_query($query);
    }

    }else{ //if query no ok.
    echo '提交有错误请重新再试';
    }
    }
    }
    }

    ?>



    Fill out the form to upload a file:

    for ($i = 0; $i < $counter; $i++) {
    echo '

    File:


    Description:



    ';
    }
    ?>





    include('include/footer.inc');
    ?>

    文件下载代码：

    // Check for an upload_id.
    if (isset($_GET['uid'])) {
    $uid = (int) $_GET['uid'];
    } else { // Big problem!
    $uid = 0;
    }

    if ($uid > 0) { // Do not proceed!

    require_once ('./conn.php'); // Connect to the database.

    // Get the information for this file.
    $query = "SELECT file_name, file_type, file_size FROM uploads WHERE upload_id=$uid";
    $result = mysql_query ($query);
    list ($fn, $ft, $fs) = mysql_fetch_array ($result);

    $the_file = 'uploads/' . $uid;

    }
    // Check if it exists.
    if (file_exists ($the_file)) {

    // Send the file.
    header ("Content-Type: $ft");
    header ("Content-disposition: attachment; filename=\"$fn\"");
    header ("Content-Length: $fs");
    readfile ($the_file);

    } else { // File doesn't exist.
    $page_title = 'File Download';
    include ('./include/header.inc');
    echo '

    The file could not be located on the server. We apologize for any inconvenience.

    ';
    include ('./include/footer.inc');
    }

    } else { // No valid upload ID.
    $page_title = 'File Download';
    include ('./include/header.inc');

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