PHP download manager simple - force downloading
A force-download script can give you more control over a file download than you would have providing a direct link. Using a force-download script, you can:
- Validate that a person is logged in
- Increment a counter in a text file
- Connect to your database and log IP information, increment a counter, and so on.
The code itself is pretty basic:
The Code
This file alone isn't secure. You will want to validate that the file doesn't provide access to your website code, files you don't want downloaded, and so on. That code will be specific to your website and needs.PHP Code:// grab the requested file's name
$file_name = $_GET['file'];
// make sure it's a file before doing anything!
if(is_file($file_name)) {
/*
Do any processing you'd like here:
1. Increment a counter
2. Do something with the DB
3. Check user permissions
4. Anything you want!
*/
// required for IE
if(ini_get('zlib.output_compression')) { ini_set('zlib.output_compression', 'Off'); }
// get the file mime type using the file extension
switch(strtolower(substr(strrchr($file_name, '.'), 1))) {
case 'pdf': $mime = 'application/pdf'; break;
case 'zip': $mime = 'application/zip'; break;
case 'jpeg':
case 'jpg': $mime = 'image/jpg'; break;
default: $mime = 'application/force-download';
}
header('Pragma: public'); // required
header('Expires: 0'); // no cache
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Last-Modified: '.gmdate ('D, d M Y H:i:s', filemtime ($file_name)).' GMT');
header('Cache-Control: private',false);
header('Content-Type: '.$mime);
header('Content-Disposition: attachment; filename="'.basename($file_name).'"');
header('Content-Transfer-Encoding: binary');
header('Content-Length: '.filesize($file_name)); // provide file size
header('Connection: close');
readfile($file_name); // push it out
exit();
}
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Originally Posted by david
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