} elseif (isset($_GET['set_course_only']) && eF_checkParameter($_GET['set_course_only'], 'id')) {
//The administrator asked to activate a lesson
if (isset($currentUser->coreAccess['lessons']) && $currentUser->coreAccess['lessons'] != 'change') {
echo urlencode(_UNAUTHORIZEDACCESS);
exit;
}
try {
$lesson = new EfrontLesson($_GET['set_course_only']);
$result = eF_getTableData("users_to_lessons", "count(*)", "lessons_ID={$_GET['set_course_only']} and archive=0");
if ($result[0]['count(*)'] > 0) {
throw new Exception(_THISLESSONHASUSERSENROLLEDPLEASEREMOVEBEFORESWITCHINGMODE);
}
$lesson->lesson['course_only'] = 1;
if (G_VERSIONTYPE == 'educational') {
#cpp#ifdef EDUCATIONAL
$lesson->deleteLessonSkill();
}
#cpp#endif
$lesson->persist();
echo "1";
} catch (Exception $e) {
handleAjaxExceptions($e);
}
exit;
} elseif (isset($_GET['add_lesson']) || isset($_GET['edit_lesson']) && eF_checkParameter($_GET['edit_lesson'], 'id')) {
//The administrator asked to add or edit a lesson
//Set the form post target in correspondance to the current function we are performing
if (isset($_GET['add_lesson'])) {
$post_target = 'add_lesson=1';
} else {
$post_target = 'edit_lesson=' . $_GET['edit_lesson'];
