OCA\OcSms\Db\ConversationStateMapper::getLastForPhoneNumber PHP Method

    public function getLastForPhoneNumber($userId, $phoneNumber)
    {
        $sql = 'SELECT MAX(int_date) as mx FROM ' . '*PREFIX*ocsms_conversation_read_states WHERE user_id = ? AND phone_number = ?';
        $query = \OCP\DB::prepare($sql);
        $result = $query->execute(array($userId, $phoneNumber));
        if ($row = $result->fetchRow()) {
            return $row["mx"];
        }
        return 0;
    }