php文件下载IE文件名乱码问题

一直用chrome浏览器，没发现问题。今天用ie6，发现文件下载时文件名乱码，ie下迅雷下载文件名也是乱码。网上查了下说在ie下需要使用urlencode编码一下，我试了下

header('Content-Disposition: attachment; filename='. rawurlencode($file_name);

结果用ie下载还是乱码。php文件本身是gbk/gb2312编码，于是我先将$file_name转换成utf-8编码再进行urlencode

header('Content-Disposition: attachment; filename='. rawurlencode(iconv("GBK","UTF-8",$file_name)));

这样使用ie下载就没问题了，难道urlencode只能对utf-8进行转义编码？

还有就是获取远程文件的大小问题，php中的filesize函数只能对本地文件进行处理，处理远程文件会失败并发出一条警告,并且在windows平台传入的参数必须是gbk/gb2312编码，使用utf-8编码将无法访问系统中的资源。

在网上找了四种获取远程文件大小的方法，多谢前辈们的分享，记录一下：

方法一：header

<?php 
get_headers($url,true); 
 
//返回结果 
Array 
( 
    [0] => HTTP/1.1 200 OK 
    [Date] => Sat, 29 May 2004 12:28:14 GMT 
    [Server] => Apache/1.3.27 (Unix)  (Red-Hat/Linux) 
    [Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT 
    [ETag] => "3f80f-1b6-3e1cb03b" 
    [Accept-Ranges] => bytes 
    [Content-Length] => 438 
    [Connection] => close 
    [Content-Type] => text/html 
) 
?> 

这里可以根据Content-Length直接获取大小了。

方法二：curl

function remote_filesize($uri,$user='',$pw='') 
{ 
    // start output buffering 
    ob_start(); 
    // initialize curl with given uri 
    $ch = curl_init($uri); 
    // make sure we get the header 
    curl_setopt($ch, CURLOPT_HEADER, 1); 
    // make it a http HEAD request 
    curl_setopt($ch, CURLOPT_NOBODY, 1); 
    // if auth is needed, do it here 
    if (!emptyempty($user) && !emptyempty($pw)) 
    { 
        $headers = array('Authorization: Basic ' . base64_encode($user.':'.$pw)); 
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); 
    } 
    $okay = curl_exec($ch); 
    curl_close($ch); 
    // get the output buffer 
    $head = ob_get_contents(); 
    // clean the output buffer and return to previous 
    // buffer settings 
    ob_end_clean(); 
 
    echo '<br>head-->'.$head.'<----end <br>'; 
 
    // gets you the numeric value from the Content-Length 
    // field in the http header 
    $regex = '/Content-Length:\s([0-9].+?)\s/'; 
    $count = preg_match($regex, $head, $matches); 
 
    // if there was a Content-Length field, its value 
    // will now be in $matches[1] 
    if (isset($matches[1])) 
    { 
        $size = $matches[1]; 
    } 
    else 
    { 
        $size = 'unknown'; 
    } 
    //$last=round($size/(1024*1024),3); 
    //return $last.' MB'; 
    return $size; 
} 

方法三：fsock

function getFileSize($url) 
{ 
    $url = parse_url($url); 
    if($fp = @fsockopen($url['host'],emptyempty($url['port'])?80:$url['port'],$error)) 
    { 
        fputs($fp,"GET ".(emptyempty($url['path'])?'/':$url['path'])." HTTP/1.1\r\n"); 
        fputs($fp,"Host:$url[host]\r\n\r\n"); 
        while(!feof($fp)) 
        { 
            $tmp = fgets($fp); 
            if(trim($tmp) == '') 
            { 
                break; 
            } 
            elseif(preg_match('/Content-Length:(.*)/si',$tmp,$arr)) 
            { 
                return trim($arr[1]); 
            } 
        } 
        return null; 
    } 
    else 
    { 
        return null; 
    } 
}

方法四：file_get_contents

$fCont = file_get_contents("http://www.cnmiss.cn/"); 
echo strlen($fCont)/1024;