/**
 * 强制下载文件
 *
 * @param 
 * @author 编程之家 jb51.cc jb51.cc
 **/
function downloadFile($file){ 
   $file_name = $file; 
   $mime = 'application/force-download'; 
   header('Pragma: public'); // required 
   header('Expires: 0'); // no cache 
   header('Cache-Control: must-revalidate,post-check=0,pre-check=0'); 
   header('Cache-Control: private',false); 
   header('Content-Type: '.$mime); 
   header('Content-Disposition: attachment; filename="'.basename($file_name).'"'); 
   header('Content-Transfer-Encoding: binary'); 
   header('Connection: close'); 
   readfile($file_name); // push it out 
   exit(); 
}


/***   来自编程之家 jb51.cc（jb51.cc）   ***/