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//main file<?php$str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";$randomstring = substr(str_shuffle($str), 0, 20).".php.txt";$_SESSION['filename']= $randomstring; $file = $randomstring;$handle = fopen($file, "w");$value = "blah\n";fwrite($handle, $value);fclose($handle);?>//download.php<?phpheader('Content-type: text/plain');header('Content-Disposition: attachment; filename="switch.php.txt"');$file = $_SESSION['filename'];readfile($file);?>