怎么反发贴机发垃圾信息
如何反发贴机发垃圾信息
最近我做了一个地方门户网站，但是总有发贴机不停的发布垃圾信息，我用了几种方式都不行，比如修改提交表的字段，修改提交的路径、文件名，都被发贴机分析出来了，请问有什么更好的方式吗？谢谢！
------解决方案--------------------
但最近也有可读验证码的发贴机了。可以很容易下载的到，最后我使用了算术题，
用rand()生成2个数，做算术运算（相加，朴减），通过session传给验证页面。
目前未见到广告了，
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