function del()
{
if ($_POST['lid'] == "") {
return "-1";
}
$db = new DBClass();
$sql = "SELECT uid FROM `app_lecture_info` WHERE lid = " . $_POST['lid'];
$result = $db->query($sql);
if ($result->num_rows <= 0) {
return "-2";
} else {
$row = $result->fetch_assoc();
$userObj = new UserClass();
$permisson = $userObj->get_privilege($_SESSION['uid']);
if ($_SESSION['uid'] != $row["uid"] && $permisson != '1') {
return "-3";
}
}
$lecture_inc = new LectureClass();
$result = $lecture_inc->del_lecture($_POST['lid']);
return $result;
}