<?php
$fileName = '03.txt';
$fileSize = filesize($fileName);
$mime = 'text/plain';
header('Content-Type: "' . $mime . '"');
header('Content-Disposition: attachment; filename="' . $fileName . '"');
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
if (strstr($_SERVER['HTTP_USER_AGENT'], 'MSIE')) {
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
} else {
header('Pragma: no-cache');
}
header('Content-Length: ' . $fileSize);
readfile($fileName);