HTTP下载文件名乱码解决方案

由于目前国际字符编码还未真正意义上的统一,编码标准多元化,在日常处理文件上传下载的时候,造成我们在处理文件名的时候会不可避免的出现乱码的情况。针对这种情况,
我们想到了一种解决方案,特此拿出来和各位童鞋们分享一下。
先贴一段代码,此为文件下载的类。

class Trs_Utils_Downloader
{
private $file=null;
private $fileRealPath =””;
private $fileName = “”;
private $fileExist =false;
private $readBytes = 0;
private $mode = “r”;

public function __destruct()
{
if(null!==$this->file){
fclose($this->file);
}
}

/**
*
* @param $fileRealPath 文件的绝对路径
* @param $fileName 真实文件名
* @param $mode 文件的读写模式
* @param $readBytes 每次读入缓冲区的字节数,默认1024 bytes
*/
public function __construct($fileRealPath, $fileName, $mode, $readBytes=1024)
{
$this->fileRealPath = $fileRealPath;
$this->fileName = $fileName;
$this->readBytes = $readBytes;
$this->mode =$mode;
}

/**
* 处理文件下载
*/
public function dealWith()
{

if(file_exists($this->fileRealPath))//检查文件是否存在
{
$this->file= fopen($this->fileRealPath,$this->mode);//打开文件
//输入文件标签
header(“Content-type: application/octet-stream”);
header(“Accept-Ranges: bytes”);
header(“Accept-Length: ” . filesize($this->fileRealPath));
if(strpos($_SERVER[“HTTP_USER_AGENT”],”MSIE”))
{
header(“Content-Disposition: attachment; filename=” . urlencode($this->fileName));
}
else{
header(“Content-Disposition: attachment; filename=” . $this->fileName);
}
while (!feof($this->file))
{
$out = fread($this->file,$this->readBytes);
if(!get_magic_quotes_gpc())
{
echo $out;
}else
{
echo stripslashes($out);
}
}
}else{
echo “File not exist!”;
}
}

}

大家看这一段代码
header(“Content-Disposition: attachment; filename=” . $this->fileName);
刚开始我用火狐下载的时候,中文或者其他国家语言的文件名没出现乱码的情况,用IE下载的时候就出现问题了,显示的是乱码,其他的主流浏览器没有出现这种情况,唯有IE会出现这种情况。询问了一位朋友,给出这样的答复:IE是默认GBK编码写入磁盘文件,其他的浏览器默认以页面编码为基准,(火狐,苹果根据默认会是UTF-8)。

于是我将代码进行了改进:
if(strpos($_SERVER[“HTTP_USER_AGENT”],”MSIE”))
{
header(“Content-Disposition: attachment; filename=” . urlencode($this->fileName));
}
else{
header(“Content-Disposition: attachment; filename=” . $this->fileName);
}
判断客户端使用的浏览器类型,如果是IE进行一次编码,就这样困扰的问题被解决了。

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