cakephp中有没有内置方法防止表单重复提交
如我做一个用户注册功能,点提交到信息确认页面,点提交，入库（入库时不在做信息的校验了如:用户名是否已存在,在进入信息确认页时,会做相应check）。
我在入库完成后,点浏览器的后退按钮会返回到信息确认页,这时在点击提交,由于没有做校验，那用户的信息就会重复入库.
我只想问的cakephp内置方法.像令牌验证这些方法我知道的.
由于接触cake没多久.希望了解的能具体说一下.
------解决方案--------------------
看看http://www.ibm.com/developerworks/cn/opensource/os-php-cake3/
这里说了
浅谈缓存
虽然使用 requireAuth 保护操作有很明显的优点，但是也有一些需要克服的缺点。大多数缺点都属于 “缓存问题”。
每当表单被 requireAuth 评估时，都会生成验证密钥。这意味着，如果一个用户提交一个含有已用过的密钥的表单，则该表单提交操作将被视为无效。在几种情况下会出现这个问题，包括（但不仅限于）使用多个浏览器窗口、使用 Back 按钮返回前一个页面、浏览器缓存、代理服务器缓存等等。您可能会把这些问题看成是用户错误，因此不予理会；您应该抵制诱惑，并着手处理无效的表单提交。
如果你使用security，在提交表单时，cakephp会自动将表单中的token和session的进行校验的，那你可以在你入库后,将session中的token值unset一下.不论用户以什么方式返回到确认页,在提交，cakephp会进行检查的,检查不通过就会回滚，你可以自己写个回滚方法，进行提示.
要是清楚核心代码.这个流程你就明白了.
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