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I have implemented hook_menu in order to set a $_SESSION var that stores the current stylesheet preference for users. Once it’s set, I’d like to redirect users back to the previous page they were viewing. How can I get the value of the previous url?
I just found the answer – referer_uri() returns the value I need and drupal_goto() will do the redirect.
So to redirect a user back to the previous page: drupal_goto( referer_uri() )