Create php_niu_3.php

from : https://www.leavesongs.com/PENETRATION/webshell-without-alphanum.html
![img](https://www.leavesongs.com/media/attachment/2017/02/17/d92e3d40-a451-4fc4-a516-e0747b721c69.2b122097850e.jpg)

add Ridter'Pentest backdoor tools @Ridter 👍

add WSO_base64.php @HARDLINUX 👍

author : HARDLINUX
url : https://github.com/HARDLINUX/webshell/
ver : WSO 2.2.0

Update and rename php/b374k to php/b374k/b374k-3.2.3.min.php