http://en.wikipedia.org/wiki/Post/Redirect/Get

我认为，至少在生产环境中，您应该为每次 POST进行此操作.

In my opinion, you should do this for every POST, at least in production.

小例子:

if ('GET' == $_SERVER['REQUEST_METHOD']) {
   //display view
}
else if ('POST' == $_SERVER['REQUEST_METHOD']) {
   //process input
   //update session
   header('Location: /next/page/to/view', true, 303);
}

想指出的是，这个旧帖子是指浏览器提交的内容.在RESTful Web服务中，您可能会用201来响应POST.

Want to point out that this old post was referring to browser submissions. In a RESTful web service you would likely respond with a 201 for POST.