<?php 
function downfile()
{
 $filename=realpath("resume.html");  //（只需文件名即可）
 $date=date("Ymd-H:i:m");
 Header( "Content-type:   application/octet-stream "); 
 Header( "Accept-Ranges:   bytes "); 
Header( "Accept-Length: " .filesize($filename));
 header( "Content-Disposition:   attachment;   filename= {$date}.doc"); 
 echo file_get_contents($filename);
 readfile($filename); 
}
downfile();
?>

/******************************************/

<?php 
function downfile($fileurl)
{
 ob_start(); 
 $filename=$fileurl;
 $date=date("Ymd-H:i:m");
 header( "Content-type:   application/octet-stream "); 
 header( "Accept-Ranges:   bytes "); 
 header( "Content-Disposition:   attachment;   filename= {$date}.doc"); 
 $size=readfile($filename); 
    header( "Accept-Length: " .$size);
}
 $url="url地址";
 downfile($url);
?>

/*********************************************/

<?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); 
}
$url="url地址";
downfile($url);
?>

内容来自：http://www.chinaaiq.com/html/wlbc/PHPbc/63958.html