}
if (!($quiz = $DB->get_record('quiz', array('id' => $cm->instance)))) {
print_error('invalidcoursemodule');
}
$quizobj = new quiz($quiz, $cm, $course);
/// Check login and sesskey.
require_login($quizobj->get_courseid(), false, $quizobj->get_cm());
if (!confirm_sesskey()) {
throw new moodle_exception('confirmsesskeybad', 'error', $quizobj->view_url());
}
/// if no questions have been set up yet redirect to edit.php
if (!$quizobj->get_question_ids() && $quizobj->has_capability('mod/quiz:manage')) {
redirect($quizobj->edit_url());
}
/// Create an object to manage all the other (non-roles) access rules.
$accessmanager = $quizobj->get_access_manager(time());
if ($quizobj->is_preview_user() && $forcenew) {
$accessmanager->clear_password_access();
}
/// Check capabilites.
if (!$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);
/**
* Creates an object to represent a new attempt at a quiz
*
* Creates an attempt object to represent an attempt at the quiz by the current
* user starting at the current time. The ->id field is not set. The object is
* NOT written to the database.
*
* @param object $quizobj the quiz object to create an attempt for.
* @param int $attemptnumber the sequence number for the attempt.
* @param object $lastattempt the previous attempt by this user, if any. Only needed
* if $attemptnumber > 1 and $quiz->attemptonlast is true.
* @param int $timenow the time the attempt was started at.
* @param bool $ispreview whether this new attempt is a preview.
*
* @return object the newly created attempt object.
*/
function quiz_create_attempt(quiz $quizobj, $attemptnumber, $lastattempt, $timenow, $ispreview = false) {
global $USER;
$quiz = $quizobj->get_quiz();
if ($quiz->sumgrades < 0.000005 && $quiz->grade > 0.000005) {
throw new moodle_exception('cannotstartgradesmismatch', 'quiz',
new moodle_url('/mod/quiz/view.php', array('q' => $quiz->id)),
array('grade' => quiz_format_grade($quiz, $quiz->grade)));
}
if ($attemptnumber == 1 || !$quiz->attemptonlast) {
// We are not building on last attempt so create a new attempt.
$attempt = new stdClass();
$attempt->quiz = $quiz->id;
$attempt->userid = $USER->id;
$attempt->preview = 0;
$attempt->layout = quiz_clean_layout($quiz->questions, true);
if ($quiz->shufflequestions) {
$attempt->layout = quiz_repaginate($attempt->layout, $quiz->questionsperpage, true);
}
} else {
// Build on last attempt.
if (empty($lastattempt)) {
print_error('cannotfindprevattempt', 'quiz');
}
$attempt = $lastattempt;
}
$attempt->attempt = $attemptnumber;
$attempt->timestart = $timenow;
$attempt->timefinish = 0;
$attempt->timemodified = $timenow;
$attempt->state = quiz_attempt::IN_PROGRESS;
// If this is a preview, mark it as such.
if ($ispreview) {
$attempt->preview = 1;
}
$timeclose = $quizobj->get_access_manager($timenow)->get_end_time($attempt);
if ($timeclose === false || $ispreview) {
$attempt->timecheckstate = null;
} else {
$attempt->timecheckstate = $timeclose;
}
return $attempt;
}