如何在PHP的Cookie中存储外部HTTP_REFERER以供以后检索？

Question

I would like to have a PHP code to do the following:

• User comes to my website from a link in an external website, in other words, the HTTP_REFERER is not from my own domain.

• Save this HTTP_REFERER in a cookie

In another part of my website I will check to see if this cookie is present and include the saved referer with the user profile.

Answer 1

Saving cookies is pretty easy (see PHP Cookies for details).

if(isset($_SERVER['HTTP_REFERER'])) {
    setcookie("externalRefer", $_SERVER['HTTP_REFERER'], time()+3600);
}

Retrieving is just as easy:

if (isset($_COOKIE['externalRefer'])) {
    echo $_COOKIE['externalRefer'];
}