protected static function userChatRelExists($user_id, $chat_id) { $conn = DbHandler::GetConnection(); $query = "SELECT id FROM user_chat_rel WHERE chat_id = " . $conn->escapeString($chat_id) . " ANd user_id = " . $conn->escapeString($user_id); $id = $conn->querySingle($query); return !is_null($id) ? TRUE : FALSE; }