利用PHP对文件进行下载：

  public function download(){
       $file = './public/Uploads/fileuri';   //下载文件存放目录  
       if (file_exists($file)) {
           header('Content-Description: File Transfer');
           header('Content-Type: application/octet-stream');
           header('Content-Disposition: attachment; filename="'.basename($file).'"');
           header('Expires: 0');
           header('Cache-Control: must-revalidate');
           header('Pragma: public');
           header('Content-Length: ' . filesize($file));
           readfile($file);
           exit;
       }else{
           echo "文件不存在";
       }

   }
Last modification：November 29, 2018
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