php 如何避免表单提交的数据才是安全的
php 如何处理表单提交的数据才是安全的
对于用户提交的表单数据需要做哪些处理才能防止js,sql的注入，防止重复提交和非法提交
怎样做才能过滤掉提交的非法数据，希望有完整代码，谢谢。
------解决方案--------------------
这个读一下《PHP和MYSQL WEB开发》就可以系统掌握了。
JS防注入：htmlspecialchars
SQL防注入：mysql_real_escape，addslashes
过滤非法数据：必须自己coding校验规则，你想怎么检查就自己写代码，用正则，用trim,isset,empty,等等。
防止非法提交：自己coding，顺序都是isset,trim,empty，其他校验，大致这么个顺序。
重复提交：在SESSION里生成一个唯一的ticket，并且把ticket添加到表单的hidden里，提交表单后校验是否一致。
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