dba_popen() establishes a persistent database instance
Commonly a regular path in your filesystem.
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.
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.