php文件下载

 1     public function downLoad(){
 2          $torrent_name=$this->_get(‘torrent_name‘);
 3          $fileName=‘./Public/Admin/download/‘.$torrent_name;
 4          if(file_exists($fileName)){//下载
 5          $fp=fopen($fileName,‘rb‘);
 6          if(!$fp){
 7              header(‘HTTP/1.1 404 Not Found‘);
 8              echo "Error: 404 Not Found.(server file path error)<!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding --><!-- Padding -->";
 9              exit;
10          }
11         $encoded_filename = urlencode($fileName);
12         $encoded_filename = str_replace("+", "%20", $encoded_filename);
13         $fileSize=@filesize($fileName);
14         $fileName=basename($fileName);
15         header(‘HTTP/1.1 200 OK‘);
16         header( "Pragma: public" );
17         header( "Expires: 0" );
18         header("Content-type: application/octet-stream");            
19         header("Accept-Ranges: bytes");
20         header("Accept-Length: ".$fileSize);            
21         $ua = $_SERVER["HTTP_USER_AGENT"];
22         if(preg_match("/MSIE/", $ua)) {
23             header(‘Content-Disposition: attachment; filename="‘ . $encoded_filename . ‘"‘);
24         }else if (preg_match("/Firefox/", $ua)) {
25             header(‘Content-Disposition: attachment; filename*="utf8\‘\‘‘ . $fileName . ‘"‘);
26         }else{
27             header(‘Content-Disposition: attachment; filename="‘ . $fileName . ‘"‘);
28         }
29         while(!feof($fp)){
30             $file_data=fread($fp,1024);
31             echo $file_data;
32         }
33         fclose($fp);
34         exit;
35     }else{
36         $this->error(‘文件信息不存在！‘);exit;
37     }
38   }