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如何防范XSS攻击

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Jun 23, 2016 pm 01:21 PM

各位大神们，我的留言评价功能，不能防范 '><script>alert(document.cookie)</script>
='><script>alert(document.cookie)</script>
等这类代码的攻击，但是我看CSDN论坛就没关系，该怎么做才能像论坛一样不怕这类字符的攻击啊？

如果实在没办法，我如果仅接受中英文（大小写）、数字，标点符号等写普通文章会用到的字符，该怎么写代码呢？

谢谢！

回复讨论(解决方案)

提交评论时使用htmlspecialchars函数过滤一下

可以使用PDO啊~~

哥，恕我愚钝。如果我是这样的代码结构：
$bid=$_POST['bid']
...
$sql= insert into “abc”（‘bid’）values （$bid） ....

我是怎么用过滤呢？例如我提交的 input name=bid,htmlspecialchars 函数是怎么用呢？
另外，我学习了一下，这个函数是干嘛的？http://www.w3school.com.cn/php/func_string_htmlspecialchars.asp上面说把预定义的字符转换为 HTML 实体。我看字符没变化呀？这是什么道理？
& （和号）成为 &
" （双引号）成为 "
' （单引号）成为 '
> （大于）成为 >

还有，如果转换了，我的理解是在数据库显示的转换了，那为什么显示在页面上又是原来用户输入的样式和内容呢？是不是还要解个码什么的？

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