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How can I share session variables across sites? [closed]

On my main Drupal site, users need to be able to select a display preference (e.g. ‘high visibility’). This will be available to registered and anonymous users but only for their session, so I plan to store their preference in a session variable, for example with $_SESSION['display'] = $my_preference;.

Another Drupal site runs on a subdomain of the main site, and needs the same functionality. And if the user visits both sites, it would be great to remember their preference.

I think that if I uncomment this line in both site’s settings.php, session variables can be accessed across sites on the same domain?

$cookie_domain = 'maindomain.com';

So then I could set $_SESSION[‘display’] on one site, and retrieve $_SESSION[‘display’] on the other?

Also, one site runs on Drupal 6 and the other on Drupal 7. Will this be a problem? Is caching for anonymous users going to cause problems?

Am I on the right lines, or is this plan flawed?

This article was republished from its original source.
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How can I share session variables across sites? [closed]

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