PHP implements support for Chinese file downloads
这篇文章主要给大家介绍了关于php实现支持中文的文件下载功能，文中通过示例代码介绍的非常详细，需要的朋友可以参考下。
前言
本文主要给大家介绍了关于php实现支持中文的文件下载功能的相关内容，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧。
问题说明
文件下载，通常有一种最为简单的方法，那就是将url直接指向服务器上文件的所在位置。但是这个方法存在很大的安全隐患。
暴露了服务器文件目录结构
无法禁止非法请求来源，无法对文件下载请求做安全验证
解决方案
一、将文件下载请求映射到后端程序url
借助http服务器（apache/nginx）实现映射功能
这里以apache为例进行说明
借助apache的rewrite模块，配置rewrite规则。（关于如何开启rewrite模块，网上很多资源，这里不再赘诉）
在项目根目录下创建.htaccess文件，写入rewrite规则
RewriteEngine on #将所有以rar/zip结尾的url，映射给download.php文件 RewriteRule (.*\.(rar|zip))$ download.php?file=$1 [NC]
将所有以rar/zip结尾的url，映射给download.php文件（这里为了方便直接映射到了一个php脚本中，如果是使用框架，那就映射到具体的控制器中的某个方法！例如：index.php?c=home&a=download）
二、编写具体的文件下载逻辑
项目目录
以本地项目为例，用户需要下载的zip文件，放在当前项目的temp目录下
示例
直接上代码，代码中有详细注释
<?php
//接收需要下载的文件名称
if(!isset($_GET['file'])) exit('Filename is empty');
if(empty($_GET['file'])) exit('Filename not valid');
ob_clean();//清除一下缓冲区
//获得文件名称
$filename = basename(urldecode($_GET['file']));
//文件完整路径（这里将真实的文件存放在temp目录下）
$filePath = __DIR__."/temp/".$filename;
//将utf8编码转换成gbk编码，否则，文件中文名称的文件无法打开
$filePath = iconv('UTF-8','gbk',$filePath);
//检查文件是否可读
if(!is_file($filePath) || !is_readable($filePath)) exit('Can not access file '.$filename);
/**
* 这里应该加上安全验证之类的代码，例如：检测请求来源、验证UA标识等等
*/
//以只读方式打开文件，并强制使用二进制模式
$fileHandle=fopen($filePath,"rb");
if($fileHandle===false){
exit("Can not open file: $filename");
}
//文件类型是二进制流。设置为utf8编码（支持中文文件名称）
header('Content-type:application/octet-stream; charset=utf-8');
header("Content-Transfer-Encoding: binary");
header("Accept-Ranges: bytes");
//文件大小
header("Content-Length: ".filesize($filePath));
//触发浏览器文件下载功能
header('Content-Disposition:attachment;filename="'.urlencode($filename).'"');
//循环读取文件内容，并输出
while(!feof($fileHandle)) {
//从文件指针 handle 读取最多 length 个字节（每次输出10k）
echo fread($fileHandle, 10240);
}
//关闭文件流
fclose($fileHandle);这里只是做了一个示例（只包括核心功能），为了方便说明直接以GET方式从url中获取用户想要下载的文件名称
注意以下两行代码（为了能够下载中文名称的文件）
$filePath = iconv('UTF-8','gbk',$filePath); header('Content-type:application/octet-stream; charset=utf-8');
如果用户需要下载的是中文名称的文件。则需要将文件路径转换成gbk编码，否则会出现 文件不存在 之类的错误。header中设置utf8编码，也是同样的道理
下载文件
打开浏览器，访问 http://127.0.0.1/rewrite/尴尬.zip 文件便开始下载了
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