表单验证 - ThinkPHP 表单隐藏 hash 值的原因是什么？
ThinkPHP 中有些表单会添加一个隐藏的hash值，看手册说是为了防止表单的重复提交等安全防护，请问这里的安全防护指的是什么？
回复内容：
ThinkPHP 中有些表单会添加一个隐藏的hash值，看手册说是为了防止表单的重复提交等安全防护，请问这里的安全防护指的是什么？
这个是为了防止重复提交的,因为有的时候,我们只能允许用户提交一次
具体原理是这样的,首先这个hash值是服务器端生成的,之后保存到session中,用户提交的时候,先判断session中是否存在,如果存在就清除该hash值,下次提交的时候,因为hash值已经无效了,提交就会失败
安全防护应该是指CSRF跨站请求伪造
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