php session does not destroy on refresh

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i am making a 10 question survey with one question at a point. i made a session for passing values between questions. the thing i discovered is that the session values do not get destroyed even on a page refresh. is there a workaround or am i doing something wrong.just to make things clear, here is the code:\[code\]session_start(); // $_SESSION['score'] = $score; $_SESSION['qnum'] = isset($_SESSION['qnum']) ? $_SESSION['qnum']+1 : 1; if ($_SESSION['qnum'] < 10){ $_SESSION['total'] = isset($_SESSION['total']) ? $_SESSION['total']+$score : $score; } else if ($_SESSION['qnum'] == 10){ $_SESSION['total'] = isset($_SESSION['total']) ? $_SESSION['total']+$score : $score; echo "finished"; } echo $_SESSION['qnum']; echo '\n'; echo $_SESSION['total'];\[/code\]