一个很好玩的游戏。

程序自动生成一个图片表达式，根据此表达式的内容，算出结果。（可根据此原理开发验证码）

（本程序需要php的gd库支持才能运行）-A very fun game.

Automatically generate a picture expression program, according to the expression of the content, the results calculated. (according to the principle of development and verification code)

(this program requires GD PHP library support to run)