我对制作下载系统有疑问。我过去做了一个,但它非常基本。我所做的是将下载的文件名添加到数据库中:
id | title | filename
---|-----------|--------------
1 | Something | something.zip
然后当用户访问download.php?id = 1时,他将被简单地重定向到: /path/to/downloads/something.zip 使用:
header('Location: /path/to/downloads/something.zip');
这会使浏览器自动开始下载。但这样做可以吗?我正在使用Codeigniter构建一个下载系统,并且有一个可用的下载助手。要提供下载,我需要:
$data = file_get_contents('/path/to/downloads/something.zip');
$name = 'Something';
force_download($name, $data);
我注意到,与简单重定向相比,由于file_get_contents(),下载速度较慢。我有一些大的下载量(最大1 GB)。你有什么建议?我应该使用Codeigniter下载帮助程序,直接使用重定向到文件或其他东西吗?
答案 0 :(得分:1)
取自php.net
function downloadFile( $fullPath ){
// Must be fresh start
if( headers_sent() )
die('Headers Sent');
// Required for some browsers
if(ini_get('zlib.output_compression'))
ini_set('zlib.output_compression', 'Off');
// File Exists?
if( file_exists($fullPath) ){
// Parse Info / Get Extension
$fsize = filesize($fullPath);
$path_parts = pathinfo($fullPath);
$ext = strtolower($path_parts["extension"]);
// Determine Content Type
switch ($ext) {
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;
default: $ctype="application/force-download";
}
header("Pragma: public"); // required
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false); // required for certain browsers
header("Content-Type: $ctype");
header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$fsize);
ob_clean();
flush();
readfile( $fullPath );
} else die('File Not Found');
}