How to implement forced download file function in php

This article mainly introduces the PHP forced download file function in detail, which has certain reference value. Interested friends can refer to it

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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