下載 function ，google 搜尋到的 修正 IE 中文檔名會錯誤的問題
使用用法，檔名可不加，不加即為路徑檔名
dl_file("路徑","檔名")function dl_file($file,$fname=""){
//First, see if the file exists
if (!is_file($file)) { die("<strong>404 File not found!</strong>"); }
//Gather relevent info about file
$filename = ($fname)? $fname:basename($file);
if(strpos($_SERVER['HTTP_USER_AGENT'] ,"MSIE")){
$filename = urlencode ($filename);
}
//Gather relevent info about file
$len = filesize($file);
$file_extension = strtolower(getExtension($file));
//This will set the Content-Type to the appropriate setting for the file
switch( $file_extension ) {
case "pdf": $ctype="application/pdf"; break;
case "exe": $ctype="application/octet-stream"; break;
case "zip": $ctype="application/zip"; break;
case "doc": $ctype="application/msword"; break;
case "xls": $ctype="application/vnd.ms-excel"; break;
case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
case "gif": $ctype="image/gif"; break;
case "png": $ctype="image/png"; break;
case "jpeg":
case "jpg": $ctype="image/jpg"; break;
case "mp3": $ctype="audio/mpeg"; break;
case "wav": $ctype="audio/x-wav"; break;
case "mpeg":
case "mpg":
case "mpe": $ctype="video/mpeg"; break;
case "mov": $ctype="video/quicktime"; break;
case "avi": $ctype="video/x-msvideo"; break;
//The following are for extensions that shouldn't be downloaded (sensitive stuff, like php files)
case "php":
case "htm":
case "html":
case "txt": $ctype="application/octet-stream"; break;
default: $ctype="application/force-download";
}
//Use the switch-generated Content-Type
//Force the download
header('Pragma: public');
header('Expires: 0');
header('Last-Modified: ' . gmdate('D, d M Y H:i ') . ' GMT');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header("Cache-Control: public");
header("Content-Type: $ctype");
header("Content-Description: File Transfer");
header('Content-Disposition: attachment; Filename="'.$filename.'"');
header('Content-Transfer-Encoding: binary');
header("Content-Length: ".$len);
@readfile($file);
exit;
}