php 下载保存文件保存到本地

<?php
function downfile()
{

 $filename=realpath("resume.html");
 Header( "Content-type:   application/octet-stream ");
 Header( "Accept-Ranges:   bytes ");
    Header( "Accept-Length: " .filesize($filename));
 Header( "Content-Disposition:   attachment;   filename= 4.html");
 echo file_get_contents($filename);
 readfile($filename);
}
downfile();

?>

<?php

function downfile($fileurl)
{
$filename=$fileurl;
$file   =   fopen($filename, "rb");
Header( "Content-type:   application/octet-stream ");
Header( "Accept-Ranges:   bytes ");
Header( "Content-Disposition:   attachment;   filename= 4.doc");

$contents = "";
while (!feof($file)) {
  $contents .= fread($file, 8192);
}
echo $contents;
fclose($file);

}
$url=$_REQUEST['url'];
$url="http://www.bioonjob.com/bioon758/showdetail7.asp?id=17182";
downfile($url);

?>