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Implementing Cross-Domain Cookies - Page 2
by: Christopher Kings-Lynne
|
November 29, 2000
Step 1: Setting Up A Prepend Script
Add the following code to a prepend script (or a function that appears at the top
of all scripts).
<?php
/* Support cross-domain cookies... */
// If the GET variable has been set, and it differs from the cookie
// variable, then use the get variable (and update the cookie)
global $HTTP_COOKIE_VARS, $HTTP_GET_VARS;
if (isset($sessionid) && isset($HTTP_GET_VARS['sessionid']) && ($HTTP_COOKIE_VARS['sessionid'] != $HTTP_GET_VARS['sessionid'])) {
SetCookie('sessionid', $HTTP_GET_VARS['sessionid'], 0, '/', '');
$HTTP_COOKIE_VARS['sessionid'] = $HTTP_GET_VARS['sessionid'];
$sessionid = $HTTP_GET_VARS['sessionid'];
}
?>
Once this code has been run, a global variable
'sessionid' will be available
to the script. It will contain the value of the sessionid from the users
cookie, or the value sent along with a GET request.Step 2: Using Variables For All Cross-Domain Hrefs
Create a global configuration file that contains the base hrefs of the domains
you are switching between. For example, if we have domain1.com and domain2.com, set
the following:
<?php
$domains['domain1'] = "http://www.domain1.com/-$sessionid-";
$domains['domain2'] = "http://www.domain2.com/-$sessionid-";
?>
Now, if you do the following in your code...
<?php
echo "Click <a href=\"", $domains['domain2'], "/contact/?email=yes\">here</a> to contact us.";
?>
...you will produce the following output...
Click <a href="http://www.domain2.com/-66543afe6543asdf6asd-/contact/?email=yes\">here</a> to contact us.
...where the sessionid has been inserted into the URL.
At this point, you are probably thinking "this will try to open a subdirectory on
the webserver called dash, sessionid, dash?!?!?". However, the next step will provide the necessary
magic to make it all work - mod_rewrite!
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