文件下载

<?php
/**
 * Created by PhpStorm.
 * User: xym
 * Date: 2017/4/1
 * Time: 10:36
 */
function downfile()
{
    $filename=realpath("1.txt"); //文件名
    $date=date("Ymd-H:i:m");
    Header( "Content-type:  application/octet-stream ");
    Header( "Accept-Ranges:  bytes ");
    Header( "Accept-Length: " .filesize($filename));
    header( "Content-Disposition:  attachment;  filename= {$date}.txt");
  //  echo file_get_contents($filename);
    readfile($filename);
}
downfile();
?>