note 49007 added to faq

I am using PHP sessions and $_SESSION["varName"]. I am trying to accomplish this: When a user buy an item onto my website, he is registered for a session as "session_start() and $_SESSION["varName"]". When the sessions registers, he can view all of his items in shopping cart. i divided two file for adding item to Database as "add_cart.php" and querying from Database as "view_cart.php". so i used "session_start()" in both file. when he buy an item i call both of file. when he want to view his basket in any time he can click view_basket icon. in this case i call only "view_cart.php" My problem is startting now. there has warning "A session had already been started - ignoring session_start() in...." after buying an item. His session will still exist, but I don't know how to check that the user session is start or not. Please help me! ---- Manual Page -- http://www.php.net/manual/en/faq.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+49007 Delete -- http://master.php.net/manage/user-notes.php?action=delete+49007&report=yes Reason: bad code -- http://master.php.net/manage/user-notes.php?action=delete+49007&report=yes&reason=bad+code Reason: spam -- http://master.php.net/manage/user-notes.php?action=delete+49007&report=yes&reason=spam Reason: useless example -- http://master.php.net/manage/user-notes.php?action=delete+49007&report=yes&reason=useless+example Reason: contains commercial links -- http://master.php.net/manage/user-notes.php?action=delete+49007&report=yes&reason=contains+commercial+links Reason: useless note -- http://master.php.net/manage/user-notes.php?action=delete+49007&report=yes&reason=useless+note Reject -- http://master.php.net/manage/user-notes.php?action=reject+49007&report=yes Search -- http://master.php.net/manage/user-notes.php