public static function edit_course_img()
{
$imgType = $_POST['imgType'];
$courseImg = $_POST['courseImg'];
$courseId = $_POST['snavId'];
$param['imgType'] = $imgType;
$param['courseImg'] = $courseImg;
$param['courseId'] = $courseId;
//update
mod_course::edit_course_img($param);
echo json_encode(array("error" => 0));
}
