PHP quiz_delete_previews函数代码示例

        }
        $moveselectedpos = $pagebreakpositions[$moveselectedonpage - 1];
        // Do the move.
        array_splice($questions, $moveselectedpos, 0, $selectedquestionids);
        $quiz->questions = implode(',', $questions);
        // Update the database.
        $DB->set_field('quiz', 'questions', $quiz->questions, array('id' => $quiz->id));
        $deletepreviews = true;
    }
    // If rescaling is required save the new maximum.
    $maxgrade = unformat_float(optional_param('maxgrade', -1, PARAM_RAW));
    if ($maxgrade >= 0) {
        quiz_set_grade($maxgrade, $quiz);
    }
    if ($deletepreviews) {
        quiz_delete_previews($quiz);
    }
    if ($recomputesummarks) {
        quiz_update_sumgrades($quiz);
        quiz_update_all_attempt_sumgrades($quiz);
        quiz_update_all_final_grades($quiz);
        quiz_update_grades($quiz, 0, true);
    }
    redirect($afteractionurl);
}
$questionbank->process_actions($thispageurl, $cm);
// End of process commands =====================================================
$PAGE->requires->yui2_lib('container');
$PAGE->requires->yui2_lib('dragdrop');
$PAGE->requires->skip_link_to('questionbank', get_string('skipto', 'access', get_string('questionbank', 'question')));
$PAGE->requires->skip_link_to('quizcontentsblock', get_string('skipto', 'access', get_string('questionsinthisquiz', 'quiz')));

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));
}
$accessmanager->do_password_check($quizobj->is_preview_user());
/// Delete any previous preview attempts belonging to this user.
quiz_delete_previews($quiz, $USER->id);
/// Create the new attempt and initialize the question sessions
$attempt = quiz_create_attempt($quiz, $attemptnumber, $lastattempt, time(), $quizobj->is_preview_user());
/// Save the attempt in the database.
if (!($attempt->id = $DB->insert_record('quiz_attempts', $attempt))) {
    quiz_error($quiz, 'newattemptfail');
}
/// Log the new attempt.
if ($attempt->preview) {
    add_to_log($course->id, 'quiz', 'preview', 'view.php?id=' . $quizobj->get_cmid(), $quizobj->get_quizid(), $quizobj->get_cmid());
} else {
    add_to_log($course->id, 'quiz', 'attempt', 'review.php?attempt=' . $attempt->id, $quizobj->get_quizid(), $quizobj->get_cmid());
}
/// Fully load all the questions in this quiz.
$quizobj->preload_questions();
$quizobj->load_questions();

/**
 * Update the database after $quiz->questions has been changed. For example,
 * this deletes preview attempts and updates $quiz->sumgrades.
 * @param $quiz the quiz object.
 */
function quiz_save_new_layout($quiz) {
    global $DB;
    $DB->set_field('quiz', 'questions', $quiz->questions, array('id' => $quiz->id));
    quiz_delete_previews($quiz);
    quiz_update_sumgrades($quiz);
}

/**
 * Given an object containing all the necessary data,
 * (defined by the form in mod_form.php) this function
 * will update an existing instance with new data.
 *
 * @param object $quiz the data that came from the form.
 * @return mixed true on success, false or a string error message on failure.
 */
function quiz_update_instance($quiz, $mform) {
    global $CFG, $DB;

    // Process the options from the form.
    $result = quiz_process_options($quiz);
    if ($result && is_string($result)) {
        return $result;
    }

    $oldquiz = $DB->get_record('quiz', array('id' => $quiz->instance));

    // Repaginate, if asked to.
    if (!$quiz->shufflequestions && !empty($quiz->repaginatenow)) {
        require_once($CFG->dirroot . '/mod/quiz/locallib.php');
        $quiz->questions = quiz_repaginate(quiz_clean_layout($oldquiz->questions, true),
                $quiz->questionsperpage);
    }
    unset($quiz->repaginatenow);

    // Update the database.
    $quiz->id = $quiz->instance;
    $DB->update_record('quiz', $quiz);

    // Do the processing required after an add or an update.
    quiz_after_add_or_update($quiz);

    if ($oldquiz->grademethod != $quiz->grademethod) {
        require_once($CFG->dirroot . '/mod/quiz/locallib.php');
        $quiz->sumgrades = $oldquiz->sumgrades;
        $quiz->grade = $oldquiz->grade;
        quiz_update_all_final_grades($quiz);
        quiz_update_grades($quiz);
    }

    // Delete any previous preview attempts.
    quiz_delete_previews($quiz);

    return true;
}

            $accessmanager->setup_attempt_page($PAGE);
            if (empty($quizobj->get_quiz()->showblocks)) {
                $PAGE->blocks->show_only_fake_blocks();
            }
            echo $output->start_attempt_page($quizobj, $mform);
            die;
        }
    }
    // Pre-flight check passed.
    $accessmanager->notify_preflight_check_passed($currentattemptid);
}
if ($currentattemptid) {
    redirect($quizobj->attempt_url($currentattemptid, $page));
}
// Delete any previous preview attempts belonging to this user.
quiz_delete_previews($quizobj->get_quiz(), $USER->id);
$quba = question_engine::make_questions_usage_by_activity('mod_quiz', $quizobj->get_context());
$quba->set_preferred_behaviour($quizobj->get_quiz()->preferredbehaviour);
// Create the new attempt and initialize the question sessions
$timenow = time();
// Update time now, in case the server is running really slowly.
$attempt = quiz_create_attempt($quizobj, $attemptnumber, $lastattempt, $timenow, $quizobj->is_preview_user());
if (!($quizobj->get_quiz()->attemptonlast && $lastattempt)) {
    // Starting a normal, new, quiz attempt.
    // Fully load all the questions in this quiz.
    $quizobj->preload_questions();
    $quizobj->load_questions();
    // Add them all to the $quba.
    $idstoslots = array();
    $questionsinuse = array_keys($quizobj->get_questions());
    foreach ($quizobj->get_questions() as $i => $questiondata) {

/**
 * Given an object containing all the necessary data,
 * (defined by the form in mod_form.php) this function
 * will update an existing instance with new data.
 *
 * @param object $quiz the data that came from the form.
 * @return mixed true on success, false or a string error message on failure.
 */
function quiz_update_instance($quiz, $mform)
{
    global $CFG, $DB;
    require_once $CFG->dirroot . '/mod/quiz/locallib.php';
    // Process the options from the form.
    $result = quiz_process_options($quiz);
    if ($result && is_string($result)) {
        return $result;
    }
    // Get the current value, so we can see what changed.
    $oldquiz = $DB->get_record('quiz', array('id' => $quiz->instance));
    // We need two values from the existing DB record that are not in the form,
    // in some of the function calls below.
    $quiz->sumgrades = $oldquiz->sumgrades;
    $quiz->grade = $oldquiz->grade;
    // Repaginate, if asked to.
    if (!$quiz->shufflequestions && !empty($quiz->repaginatenow)) {
        $quiz->questions = quiz_repaginate(quiz_clean_layout($oldquiz->questions, true), $quiz->questionsperpage);
    }
    unset($quiz->repaginatenow);
    // Update the database.
    $quiz->id = $quiz->instance;
    $DB->update_record('quiz', $quiz);
    // Do the processing required after an add or an update.
    quiz_after_add_or_update($quiz);
    if ($oldquiz->grademethod != $quiz->grademethod) {
        quiz_update_all_final_grades($quiz);
        quiz_update_grades($quiz);
    }
    $quizdateschanged = $oldquiz->timelimit != $quiz->timelimit || $oldquiz->timeclose != $quiz->timeclose || $oldquiz->graceperiod != $quiz->graceperiod;
    if ($quizdateschanged) {
        quiz_update_open_attempts(array('quizid' => $quiz->id));
    }
    // Delete any previous preview attempts.
    quiz_delete_previews($quiz);
    return true;
}

 /**
  * This adds a particular question to the supplied quiz. Based on /mod/quiz/edit.php
  *
  * @param int $questionid
  * @param stdClass $quiz
  * @return void
  */
 public function add_question_to_quiz($questionid, $quiz)
 {
     quiz_require_question_use($questionid);
     quiz_add_quiz_question($questionid, $quiz, 0);
     quiz_delete_previews($quiz);
     quiz_update_sumgrades($quiz);
 }

/**
 * Prepare and start a new attempt deleting the previous preview attempts.
 *
 * @param  quiz $quizobj quiz object
 * @param  int $attemptnumber the attempt number
 * @param  object $lastattempt last attempt object
 * @param bool $offlineattempt whether is an offline attempt or not
 * @return object the new attempt
 * @since  Moodle 3.1
 */
function quiz_prepare_and_start_new_attempt(quiz $quizobj, $attemptnumber, $lastattempt, $offlineattempt = false)
{
    global $DB, $USER;
    // Delete any previous preview attempts belonging to this user.
    quiz_delete_previews($quizobj->get_quiz(), $USER->id);
    $quba = question_engine::make_questions_usage_by_activity('mod_quiz', $quizobj->get_context());
    $quba->set_preferred_behaviour($quizobj->get_quiz()->preferredbehaviour);
    // Create the new attempt and initialize the question sessions
    $timenow = time();
    // Update time now, in case the server is running really slowly.
    $attempt = quiz_create_attempt($quizobj, $attemptnumber, $lastattempt, $timenow, $quizobj->is_preview_user());
    if (!($quizobj->get_quiz()->attemptonlast && $lastattempt)) {
        $attempt = quiz_start_new_attempt($quizobj, $quba, $attempt, $attemptnumber, $timenow);
    } else {
        $attempt = quiz_start_attempt_built_on_last($quba, $attempt, $lastattempt);
    }
    $transaction = $DB->start_delegated_transaction();
    // Init the timemodifiedoffline for offline attempts.
    if ($offlineattempt) {
        $attempt->timemodifiedoffline = $attempt->timemodified;
    }
    $attempt = quiz_attempt_save_started($quizobj, $quba, $attempt);
    $transaction->allow_commit();
    return $attempt;
}

//.........这里部分代码省略.........
    if (respondusws_floatcompare($CFG->version, 2013111800, 2) >= 0) {
        $r_ctx = context::instance_by_id($r_qca->contextid);
    } else {
        $r_ctx = get_context_instance_by_id($r_qca->contextid);
    }
    $r_qcci = RWSGCFCat($r_ctx);
    if ($r_qcci != $r_cid) {
        if (is_siteadmin($RWSUID)) {
            if ($r_qcci != SITEID) {
                RWSSErr("2109");
            }
        } else {
            RWSSErr("2084");
        }
    }
    $r_pm = RWSGSOpt("qcount", PARAM_ALPHANUM);
    if ($r_pm === false || strlen($r_pm) == 0) {
        RWSSErr("2085");
    }
    $r_qct = intval($r_pm);
    if ($r_qct <= 0) {
        RWSSErr("2085");
    }
    $r_pm = RWSGSOpt("qgrade", PARAM_NOTAGS);
    if ($r_pm === false || strlen($r_pm) == 0) {
        RWSSErr("2086");
    }
    $r_qg = round(floatval($r_pm));
    if ($r_qg <= 0) {
        RWSSErr("2086");
    }
    $r_mr = $DB->get_record("modules", array("id" => $r_cmod->module));
    if ($r_mr === false) {
        RWSSErr("2043");
    }
    $r_qiz = $DB->get_record($r_mr->name, array("id" => $r_cmod->instance));
    if ($r_qiz === false) {
        RWSSErr("2044");
    }
    if (!isset($r_qiz->instance)) {
        $r_qiz->instance = $r_qiz->id;
    }
    $r_aerr = 0;
    for ($r_i = 0; $r_i < $r_qct; $r_i++) {
        $r_qst = new stdClass();
        $r_qst->qtype = RWSRND;
        $r_qst->parent = 0;
        $r_qst->hidden = 0;
        $r_qst->length = 1;
        $r_qst->questiontext = 1;
        if (respondusws_floatcompare($CFG->version, 2011070100, 2) >= 0) {
            $r_rqt = question_bank::get_qtype("random");
            $r_qst->name = $r_rqt->question_name($r_qca, !empty($r_qst->questiontext));
        } else {
            $r_qst->name = random_qtype::question_name($r_qca, !empty($r_qst->questiontext));
        }
        $r_qst->questiontextformat = FORMAT_HTML;
        $r_qst->penalty = 0;
        if (respondusws_floatcompare($CFG->version, 2011070100, 2) >= 0) {
            $r_qst->defaultmark = $r_qg;
        } else {
            $r_qst->defaultgrade = $r_qg;
        }
        $r_qst->generalfeedback = "";
        $r_qst->generalfeedbackformat = FORMAT_HTML;
        $r_qst->category = $r_qca->id;
        $r_qst->stamp = make_unique_id_code();
        $r_qst->createdby = $RWSUID;
        $r_qst->modifiedby = $RWSUID;
        $r_qst->timecreated = time();
        $r_qst->timemodified = time();
        $r_qst->id = $DB->insert_record("question", $r_qst);
        $DB->set_field("question", "parent", $r_qst->id, array("id" => $r_qst->id));
        $r_h = question_hash($r_qst);
        $DB->set_field("question", "version", $r_h, array("id" => $r_qst->id));
        if (respondusws_floatcompare($CFG->version, 2011070100, 2) >= 0) {
            quiz_add_quiz_question($r_qst->id, $r_qiz);
        } else {
            $r_ok = quiz_add_quiz_question($r_qst->id, $r_qiz);
            if (!$r_ok) {
                $DB->delete_records("question", array("id" => $r_qst->id));
                $r_aerr++;
            }
        }
    }
    if ($r_aerr > 0) {
        RWSSErr("2087,{$r_aerr}");
    }
    if ($r_aerr < $r_qct) {
        quiz_delete_previews($r_qiz);
    }
    if (respondusws_floatcompare($CFG->version, 2014051200, 2) >= 0) {
        quiz_update_sumgrades($r_qiz);
    } else {
        $r_qiz->grades = quiz_get_all_question_grades($r_qiz);
        $r_sumg = array_sum($r_qiz->grades);
        $DB->set_field("quiz", "sumgrades", $r_sumg, array("id" => $r_qiz->id));
    }
    RWSSStat("1006");
}

 private static function accessmanager_process($quizobj, $accessmanager, $forcenew, $uid)
 {
     self::new_preview_request($quizobj, $accessmanager, $forcenew, $uid);
     // Look for an existing attempt.
     $attempts = quiz_get_user_attempts($quizobj->get_quizid(), $uid, 'all', true);
     $lastattempt = end($attempts);
     // Get number for the next or unfinished attempt.
     if ($lastattempt && !$lastattempt->preview && !$quizobj->is_preview_user()) {
         $attemptnumber = $lastattempt->attempt + 1;
     } else {
         $lastattempt = false;
         $attemptnumber = 1;
     }
     $currentattemptid = null;
     $accessmanager->notify_preflight_check_passed($currentattemptid);
     // Delete any previous preview attempts belonging to this user.
     quiz_delete_previews($quizobj->get_quiz(), $uid);
     $res = new stdClass();
     $res->lastattempt = $lastattempt;
     $res->attemptnumber = $attemptnumber;
     return $res;
 }