(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SQLite3Result::columnName — Returns the name of the nth column
   Returns the name of the column specified by the
   column.
   Note that the name of a result column is the value of the AS clause
   for that column, if there is an AS clause. If there is no AS
   clause then the name of the column is unspecified and may change from one release of libsqlite3
   to the next.
  
columnThe numeric zero-based index of the column.