abstract class Model {

    protected function create (array $data) {

        $create_table = $this->table_name;
        //insere no banco
    }

}

class smsModel extends Model {

    private $table_name = 'sms_config';
    private $log_table_name = 'sms_log';

    public function create (array $data) {

        return parent::create($data);
    }

    public function create_sms_log (array $data) {
        $this->table_name = $this->log_table_name;
        return parent::create($data);

    }

}