note 16772 added to function.str-replace

I didn't see this documented anywhere, but I'm trying to use str_replace to delete users in a peice of code i'm working on, but an error message, saying "Warning: The length of the needle must not be 0" shows up. This is the code, any ideas? ($todelete is inherited from the previous page, its the number of the user to delete.) $open = fopen("userlist.txt", "r"); $saved = fread($open, filesize("userlist.txt")); fclose($open); str_replace("$username[$todelete]", "", $saved); $open = fopen("userlist.txt", "w"); fwrite($open, $saved); fclose($open); -- http://www.php.net/manual/en/function.str-replace.php http://master.php.net/manage/user-notes.php?action=edit+16772 http://master.php.net/manage/user-notes.php?action=delete+16772 http://master.php.net/manage/user-notes.php?action=reject+16772