$activeadmlist = "user_list.txt";$pos = strpos($activeadmlist, $_SESSION['username']);if ($pos === false) {$output= $_SESSION['username']."\n";$newfile="user_list.txt";$file = fopen ($newfile, "a");fwrite($file, $output);fclose ($file); } else { }
// change this:$pos = strpos($activeadmlist, $_SESSION['username']);// to this:$pos = strpos(file_get_contents($activeadmlist), $_SESSION['username']);