有人说还要过滤XSS 可是不知道怎么过滤XSS怎么办？ 还有像长度 数据类型这些是不是只要在前端过滤就行了？
回复讨论(解决方案)
PDO是过滤mysql注入
XSS可以使用htmlentities($str); 输出来防止
从头学什么是sql注入、xss，代码写的不好，用pdo一样可以存在sql注入
必须过滤啊！
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