Help with CSV files

Hi, I'm trying out various programs with PHP and am now on the topic of CSV files. My program contained minor errors which were soon fixed (the path of the DBA extension, etc.) But now I have this new error that I can't seem to solve. The statement in question is $i = dba_open($dbpath, "w", $dbtype); // $dbtype = "db2" I get the error, Warning: no such handler: db2 in F:\PHPSTUFF\Adbook.php on line 6 Changing the value of $dbtype from "db2" to "dba", "gdbm", etc. all result in the same kind of error for each type!. Am i missing something here? Do I have to install any modules that i'm not aware of. I was under the impression that php supported these types internally. One more thing ... what's the difference between dba_open() and dbmopen(), dba_fetch(), dbmfetch() etc thanks. RJ