问题
simple question:
how to find the location (url) where a user came from before accessing my page?
and
how to find the location (url) where a user goes after exiting my webpage?
any ideas where i should start? thanks
回答1:
In PHP, you can use the $_SERVER['HTTP_REFERER'] to know where the user came from.
There is no mechanism to know where the user is going, unless they clicked a link on your site to leave your page. (If that is the kind of exit that you want to track, you'll need to rely on javascript and implement something like Google Analytics outbound link tracking: http://www.google.com/support/analytics/bin/answer.py?answer=55527)
回答2:
To the first question:
Usually if someone comes to your page via a link or something like this a HTTP referer entry points to the refering page. See rfc2616
Second question:
If you have a link which links to an external page you may notice this by wrapping these links with some script. If someone types in a page by hand you will not be able to determine the location where the user went.
回答3:
If the from page and destination pages are made by you, You can send the source page's url within GET or POST method and grab it in the destination and redirect user back to that url.
来源：https://stackoverflow.com/questions/6795128/php-how-to-find-the-location-where-a-user-came-from