basic php force file download script

<?php
$filename = $_GET[‘file’];
// required for IE, otherwise Content-disposition is ignored
if(ini_get(‘zlib.output_compression’))
ini_set(‘zlib.output_compression’, ‘Off’);

$file_extension = strtolower(substr(strrchr($filename,”.”),1));
if( $filename == “” )
{
echo “<html><title></title><body>ERROR: download file NOT SPECIFIED.</body></html>”;
exit;
}
switch( $file_extension )
{
case “pdf”: $ctype=”application/pdf”; break;
case “txt”: $ctype=”text/plain”; break;
case “html”: $ctype=”text/html”; break;
case “htm”: $ctype=”text/html”; 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”: $ctype=”image/jpg”; break;
case “jpg”: $ctype=”image/jpg”; break;
case “php”: $ctype=”text/plain”; 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: $ctype”);
header(“Content-Disposition: attachment; filename=\””.basename($filename).”\”;” );
header(“Content-Transfer-Encoding: binary”);
header(“Content-Length: “.filesize($filename));
set_time_limit(0);
@readfile(“$filename”) or die(“File not found.”);
exit();
?>

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