public static function convertCourseUserConstraintsToSqlParameters($constraints) { list($where, $limit, $orderby) = EfrontCourse::convertLessonConstraintsToSqlParameters($constraints); $where = EfrontUser::addWhereConditionToUserConstraints($constraints); $limit = self::addLimitConditionToConstraints($constraints); $order = self::addSortOrderConditionToConstraints($constraints); return array($where, $limit, $order); }