JS或PHP确定我的页面是否在我的域内访问

Question

Is there a reliable way (other than use of cookies) to determine if a particular link within my site was used to access a page in my site or not?

If no, is there a reliable method to determine if a page on my site was accessed from within my domain or if it was reached from another site?

I would prefer the first method but the second may work.

Answer 1

Use $_SERVER['HTTP_REFERER'] to determine the referring URL: http://php.net/manual/en/reserved.variables.server.php