How to download php File: Php file download

<?php
/** Author Zhangzhaoyu 2012-9-13 2:28:18 **/
/**
*
* @param unknown_type $file _name
* @param unknown_type $file _sub_path "xxx/xxx/"
*
*/
function Down_file ($file _name, $file _sub_dir) {
$file _path = $_server["Document_root"]. $file _sub_dir. $file _name;
if (!file_exists ($file _path)) {
echo "File not exist!";
echo $file _path;
return;
}
$file = fopen ($file _path, "R");
$file _size = filesize ($file _path);
The return file
Header ("Content-type:application/octet-stream");
Return by bytes
Header ("Accept-ranges:bytes");
Return the size of the file
Header ("Accept-length:"). $file _size);
Return the name of the file pop-up download box corresponding to the filename
Header ("content-disposition:attachment; Filename= ". $file _name);
Sending data to clients
$buffer = 1024;
$file _count = 0;
while (!feof ($file) && (($file _size-$file _count)) > 0) {
$file _data = fread ($file, $buffer);
$file _count + + $buffer;
echo $file _data;
}
Fclose ($file);
Exit ();
}
$file _name = $_request["filename"];
Down_file ($file _name, "/helloworld/project/up/");
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