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Hi, I recently restructured a website along the modularization lines (page 44 onwards). The content modules all start with a check to see if the BASE_URL constant has been defined and redirect the user if it has not been defined. This is clear and works just fine in the visitor-accessible part of the site. In the administration part of my website, the modules also check to make sure that an administrator is using the script via a check to a session set up like page 82 onwards. I am having trouble with 'headers already sent' and understand why this is happening and know how