php force download file function

The example in this article shares with you the PHP forced download file function for your reference. The specific content is as follows

public function down()
 
{
  $id = $this->_get('id');
  $M = M("downloads");
  $data=$M->where("id=$id and status=1")->find();
  !$data && exit;
  $filename = iconv('UTF-8','GBK',$data['filename']);
  $savename = $data['savename']; 
  $myfile = $data[url] ? $data[url] : 'Uploads/file/'.$savename;
  if(file_exists($myfile)){
  　　$M->where("id=$id")->setInc('downloads');
  　　$file = @ fopen($myfile, "r");
  　　header("Content-type: application/octet-stream");
  　　header("Content-Disposition: attachment; filename=" .$filename );
  　　while (!feof($file)) {
    echo fread($file, 50000);
  　　}
  　　fclose($file);
  　　exit;
  }else{
  　　echo '文件不存在！';
 
  }
}

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