php ie下载文件名乱码的解决办法：1、通过header方法解决乱码；2、通过“function remote_filesize($uri,$user='',$pw='') {...}”等方法解决乱码。
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php文件下载IE文件名乱码问题
一直用chrome浏览器，没发现问题。今天用ie6，发现文件下载时文件名乱码，ie下迅雷下载文件名也是乱码。网上查了下说在ie下需要使用urlencode编码一下，我试了下
header('Content-Disposition: attachment; filename='. rawurlencode($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$file_name转换成utf-8编码再进行urlencode
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header('Content-Disposition: attachment; filename='. rawurlencode(iconv("GBK","UTF-8",$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; 
