code: function getOne($sql, $params = array())
      {
          //echo 'get one --- ';
  
          $data = $this->query ($sql, $params);
  
          if (count ($data) > 0)
          {
              $data = array_values ($data[0]);
              return $data[0];
          }
          return false;
      }
docs: Run an SQL query and return the first column of the first row
  of the result set, if any.
  
  @param string $sql An SQL string with placeholders.  The
  placeholders are assumed to be specific to the database engine
  for this connection.
  
  @param array $params An array of parameters to insert into the
  SQL string using this connection's escaping mechanism.
  
  @return mixed $result The value of the first column of the
  first row of the result set.  False if no such result was
  found.