php file download code

This article provides you with this php tutorial file download code is a use of the header to send the file code to the client's browser to download Oh.

<?
function download ($ file_dir, $ file_name)
//Parameter Description:
// file_dir: directory of the file
// file_name: file name
{
$ file_dir = chop ($ file_dir); / / Remove extra space in the path
// Get the path of the file to download
if ($ file_dir! = '')
{
$ file_path = $ file_dir;
if (substr ($ file_dir, strlen ($ file_dir) -1, strlen ($ file_dir))! = '/')
$ file_path. = '/';
$ file_path. = $ file_name;
}
else
$ file_path = $ file_name;

/ / Determine whether the file to download exists
if (! file_exists ($ file_path))
{
echo 'Sorry, the file you want to download does not exist. ';
return false;
}

$ file_size = filesize ($ file_path);

header ("Content-type: application / octet-stream");
header ("Accept-Ranges: bytes"); // jzread.com
header ("Accept-Length: $ file_size");
header ("Content-Disposition: attachment; filename =". $ file_name);

$ fp = fopen ($ file_path, "r");
$ buffer_size = 1024;
$ cur_pos = 0;

while (! feof ($ fp) && $ file_size- $ cur_pos> $ buffer_size)
{
$ buffer = fread ($ fp, $ buffer_size);
echo $ buffer;
$ cur_pos + = $ buffer_size;
}

$ buffer = fread ($ fp, $ file_size- $ cur_pos);
echo $ buffer;
fclose ($ fp);
return true;

}

?>