dba_popen() establishes a persistent database instance
for path with mode using
handler.
Parameters
path
Commonly a regular path in your filesystem.
mode
It is r for read access, w for
read/write access to an already existing database, c
for read/write access and database creation if it doesn't currently exist,
and n for create, truncate and read/write access.
handler
The name of the handler which
shall be used for accessing path. It is passed
all optional parameters given to dba_popen() and
can act on behalf of them.
Return Values
Returns a positive handle on success, or FALSE on failure.
