public static function validateId($id)
{
if (is_null($id)) {
throw new Exception("Instructor is required.");
}
if (!preg_match("/^[0-9]+\$/", $id)) {
throw new Exception("Data has been tempered. Aborting process.");
}
if (!InstructorFetcher::idExists($id)) {
// TODO: sent email to developer relevant to this error.
throw new Exception("Either something went wrong with a database query, or you're trying to hack this app. In either case, the developers were just notified about this.");
}
}
