lliolvye 2018-08-23 09:37 采纳率: 100%
浏览 692
已结题

PHP 文件下载,下载后的文件和源文件内容不一样

新手自学,部分代码如下:
html代码:

 <form action="download_file.php" method="get">

            <input  name="filename" type="text" style="width: 17%;" value="" placeholder="请输入文件名,英文区分大小写" />

            <input type="submit" value="搜索" />

        </form>

download_file.php代码:


$file_name = $_GET['filename'];

    $file_dir="upload/";

        $file=fopen($file_dir.$file_name,"r");//打开文件
        //echo($file_dir.$file_name);
        Header("Content-type: application/octet-stream");  
         Header("Accept-Ranges:bytes");  
        Header("Accept-Length:".filesize($file_dir.$file_name));  
        Header("Content-Disposition: attachment; filename=".$file_name);
        readfile($file_dir.$file_name);

比如说我下载一个.txt的文件,执行文件后,得到的.txt文件里的内容和源文件完全不一样;
图片说明

另一个问题是在搜索栏里如何只搜索文件名就能下载,而不用输入文件名+后缀,
请教大神代码解答!

  • 写回答

2条回答

  • 杨家八公子 2018-08-23 10:21
    关注
    
    

    <?php
    /**

    • CodeIgniter *
    • An open source application development framework for PHP *
    • This content is released under the MIT License (MIT) *
    • Copyright (c) 2014 - 2017, British Columbia Institute of Technology *
    • Permission is hereby granted, free of charge, to any person obtaining a copy
    • of this software and associated documentation files (the "Software"), to deal
    • in the Software without restriction, including without limitation the rights
    • to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    • copies of the Software, and to permit persons to whom the Software is
    • furnished to do so, subject to the following conditions: *
    • The above copyright notice and this permission notice shall be included in
    • all copies or substantial portions of the Software. *
    • THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    • IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    • FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    • AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    • LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    • OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    • THE SOFTWARE. *
    • @package CodeIgniter
    • @author EllisLab Dev Team
    • @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
    • @copyright Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
    • @license http://opensource.org/licenses/MIT MIT License
    • @link https://codeigniter.com
    • @since Version 1.0.0
    • @filesource */ defined('BASEPATH') OR exit('No direct script access allowed');

    /**

    // ------------------------------------------------------------------------

    if ( ! function_exists('force_download'))
    {
    /**
    * Force Download
    *
    * Generates headers that force a download to happen
    *
    * @param string filename
    * @param mixed the data to be downloaded
    * @param bool whether to try and send the actual file MIME type
    * @return void
    */
    function force_download($filename = '', $data = '', $set_mime = FALSE)
    {
    if ($filename === '' OR $data === '')
    {
    return;
    }
    elseif ($data === NULL)
    {
    if ( ! @is_file($filename) OR ($filesize = @filesize($filename)) === FALSE)
    {
    return;
    }

            $filepath = $filename;
            $filename = explode('/', str_replace(DIRECTORY_SEPARATOR, '/', $filename));
            $filename = end($filename);
        }
        else
        {
            $filesize = strlen($data);
        }
    
        // Set the default MIME type to send
        $mime = 'application/octet-stream';
    
        $x = explode('.', $filename);
        $extension = end($x);
    
        if ($set_mime === TRUE)
        {
            if (count($x) === 1 OR $extension === '')
            {
                /* If we're going to detect the MIME type,
                 * we'll need a file extension.
                 */
                return;
            }
    
            // Load the mime types
            $mimes =& get_mimes();
    
            // Only change the default MIME if we can find one
            if (isset($mimes[$extension]))
            {
                $mime = is_array($mimes[$extension]) ? $mimes[$extension][0] : $mimes[$extension];
            }
        }
    
        /* It was reported that browsers on Android 2.1 (and possibly older as well)
         * need to have the filename extension upper-cased in order to be able to
         * download it.
         *
         * Reference: http://digiblog.de/2011/04/19/android-and-the-download-file-headers/
         */
        if (count($x) !== 1 && isset($_SERVER['HTTP_USER_AGENT']) && preg_match('/Android\s(1|2\.[01])/', $_SERVER['HTTP_USER_AGENT']))
        {
            $x[count($x) - 1] = strtoupper($extension);
            $filename = implode('.', $x);
        }
    
        if ($data === NULL && ($fp = @fopen($filepath, 'rb')) === FALSE)
        {
            return;
        }
    
        // Clean output buffer
        if (ob_get_level() !== 0 && @ob_end_clean() === FALSE)
        {
            @ob_clean();
        }
    
        // Generate the server headers
        header('Content-Type: '.$mime);
        header('Content-Disposition: attachment; filename="'.$filename.'"');
        header('Expires: 0');
        header('Content-Transfer-Encoding: binary');
        header('Content-Length: '.$filesize);
        header('Cache-Control: private, no-transform, no-store, must-revalidate');
    
        // If we have raw data - just dump it
        if ($data !== NULL)
        {
            exit($data);
        }
    
        // Flush 1MB chunks of data
        while ( ! feof($fp) && ($data = fread($fp, 1048576)) !== FALSE)
        {
            echo $data;
        }
    
        fclose($fp);
        exit;
    }
    

    }

    
    
    评论

报告相同问题?

悬赏问题

  • ¥15 求差集那个函数有问题,有无佬可以解决
  • ¥15 【提问】基于Invest的水源涵养
  • ¥20 微信网友居然可以通过vx号找到我绑的手机号
  • ¥15 寻一个支付宝扫码远程授权登录的软件助手app
  • ¥15 解riccati方程组
  • ¥15 display:none;样式在嵌套结构中的已设置了display样式的元素上不起作用?
  • ¥15 使用rabbitMQ 消息队列作为url源进行多线程爬取时,总有几个url没有处理的问题。
  • ¥15 Ubuntu在安装序列比对软件STAR时出现报错如何解决
  • ¥50 树莓派安卓APK系统签名
  • ¥65 汇编语言除法溢出问题