/**
* Get the previous lesson in row, or in the course, if specified
*
* @param EfrontLesson $lesson The lesson to account
* @param mixed $course The course to regard, or false
* @return int The id of the previous lesson in row
* @since 3.6.3
* @access public
*/
public function getPreviousLesson($lesson, $course = false)
{
$previousLesson = false;
if ($course) {
$course instanceof EfrontCourse or $course = new EfrontCourse($course);
$eligibility = new ArrayIterator($course->checkRules($_SESSION['s_login']));
while ($eligibility->valid() && ($key = $eligibility->key()) != $lesson->lesson['id']) {
$previous = $key;
$eligibility->next();
}
if (isset($previous) && $previous) {
$previousLesson = $previous;
}
} else {
$directionsTree = new EfrontDirectionsTree();
$userLessons = new ArrayIterator($directionsTree->getLessonsList($this->getUserLessons()));
while ($userLessons->valid() && ($key = $userLessons->current()) != $lesson->lesson['id']) {
$previous = $key;
$userLessons->next();
}
if (isset($previous) && $previous) {
$previousLesson = $previous;
}
}
return $previousLesson;
}
} else {
if ($_GET['new_lessons_ID'] == $_SESSION['s_lessons_ID']) {
$smarty->assign("T_SHOW_LOADED_LESSON_OPTIONS", 1);
}
}
}
/*This is the first time the professor enters this lesson, so register the lesson id to the session*/
if (isset($_GET['lessons_ID']) && eF_checkParameter($_GET['lessons_ID'], 'id')) {
if (!isset($_SESSION['s_lessons_ID']) || $_GET['lessons_ID'] != $_SESSION['s_lessons_ID'] || isset($_GET['from_course']) && $_GET['from_course'] != $_SESSION['s_courses_ID']) {
if (isset($_GET['course']) || isset($_GET['from_course'])) {
if ($_GET['course']) {
$course = new EfrontCourse($_GET['course']);
} else {
$course = new EfrontCourse($_GET['from_course']);
}
$eligibility = $course->checkRules($_SESSION['s_login']);
if ($eligibility[$_GET['lessons_ID']] == 0) {
unset($_GET['lessons_ID']);
$message = _YOUCANNOTACCESSTHISLESSONBECAUSEOFCOURSERULES;
eF_redirect("student.php?ctg=lessons&message=" . urlencode($message) . "&message_type=failure");
}
$_SESSION['s_courses_ID'] = $course->course['id'];
} else {
unset($_SESSION['s_courses_ID']);
}
if (in_array($_GET['lessons_ID'], array_keys($userLessons))) {
$newLesson = new EfrontLesson($_GET['lessons_ID']);
if (!isset($_GET['course']) && !isset($_GET['from_course']) && $roles[$userLessons[$_GET['lessons_ID']]] == 'student' && ($newLesson->lesson['from_timestamp'] && $newLesson->lesson['from_timestamp'] > time() || $newLesson->lesson['to_timestamp'] && $newLesson->lesson['to_timestamp'] < time())) {
eF_redirect("student.php?ctg=lessons&message=" . urlencode(_YOUCANNOTACCESSTHISLESSONORITDOESNOTEXIST));
}
$_SESSION['s_lessons_ID'] = $_GET['lessons_ID'];
