/// Check capabilites.
if (!$quizobj->is_preview_user()) {
$quizobj->require_capability('mod/quiz:attempt');
}
/// Check to see if a new preview was requested.
if ($quizobj->is_preview_user() && $forcenew) {
/// To force the creation of a new preview, we set a finish time on the
/// current attempt (if any). It will then automatically be deleted below
$DB->set_field('quiz_attempts', 'timefinish', time(), array('quiz' => $quiz->id, 'userid' => $USER->id));
}
/// Look for an existing attempt.
$lastattempt = quiz_get_latest_attempt_by_user($quiz->id, $USER->id);
if ($lastattempt && !$lastattempt->timefinish) {
/// Continuation of an attempt - check password then redirect.
$accessmanager->do_password_check($quizobj->is_preview_user());
redirect($quizobj->attempt_url($lastattempt->id));
}
/// Get number for the next or unfinished attempt
if ($lastattempt && !$lastattempt->preview && !$quizobj->is_preview_user()) {
$lastattemptid = $lastattempt->id;
$attemptnumber = $lastattempt->attempt + 1;
} else {
$lastattempt = false;
$lastattemptid = false;
$attemptnumber = 1;
}
/// Check access.
$messages = $accessmanager->prevent_access() + $accessmanager->prevent_new_attempt($attemptnumber - 1, $lastattempt);
if (!$quizobj->is_preview_user() && $messages) {
print_error('attempterror', 'quiz', $quizobj->view_url(), $accessmanager->print_messages($messages, true));
}