php文件下载(防止中文文件名乱码)的示例代码

<?php
/**
* php文件下载代码，中文无乱码
* by www.jb200.com
*/
    $file = "/tmp/中文名.tar.gz";
 
    $filename = basename($file);
 
    header("Content-type: application/octet-stream");
 
    //处理中文文件名
    $ua = $_SERVER["HTTP_USER_AGENT"];
    $encoded_filename = urlencode($filename);
    $encoded_filename = str_replace("+", "%20", $encoded_filename);
    if (preg_match("/MSIE/", $ua)) {
     header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
    } else if (preg_match("/Firefox/", $ua)) {
     header("Content-Disposition: attachment; filename*="utf8''" . $filename . '"');
    } else {
     header('Content-Disposition: attachment; filename="' . $filename . '"');
    }
 
    header('Content-Disposition: attachment; filename="' . $filename . '"');
    header("Content-Length: ". filesize($file));
    readfile($file);