CHINZO-72C编码的算法是什么? 反向工程或尝试揭示php的源代码?

According to this website: http://crypo.in.ua/tools/eng_chinzo-72c.php it encodes plaintext into a Chinese character cipher.

I couldn't find any information about it's algorithm, is there a way to reverse engineer this encoding or the PHP page's source code?

For example:

a

encodes to

法 吴

and

aa

encodes to

法 法 吴

and

aab

encodes to

法 法 弗 吴

Hmm actually, I think it's really easy to decode this... But I am not sure why the page says "Can not decrypt the Chinese characters of which was not encrypted by this script."

So this is just a simple substitution cipher:

a = 法
b = 弗
c = 朗
d = 斯
e = 伐
...
A = 呢
...
+ = 题 防 命
 (just a 1 character space) = 题 防 呒
(End of Line) = 吴
...
0 = 呒