Why is there no dba in MAMR?

Question

MAMP

the first time I tried to create a .dba file on the server, I found out that there is no such line in php.ini:
extension=php_dba.dll // from which it is necessary to remove the comment
, the thought immediately arose that MAMP does not support this technology,
but why - it is not clear
I tried versions 1.6 and 1.9. 6.1
and trial php script didn't create file in folder

$id=dba_open("test.db", "c", "flatfile");
dba_close($id);