Whether to use mixed case (0), upper case
(1) or lower case (2) hash
This option is primarily useful when you need compatibility with other
database systems, where the names of the columns are always returned as
uppercase or lowercase, regardless of the case of the actual field names
in the database schema.
The SQLite library returns the column names in their natural case (that
matches the case you used in your schema). When
is set to 0
the natural case will be preserved. When it is set to
1 or 2, PHP will apply case
folding on the hash keys to upper- or lower-case the keys, respectively.
Use of this option incurs a slight performance penalty, but is MUCH
faster than performing the case folding yourself using PHP script.