I can not connect to a local bank in firebird.
Since I enabled the following extensions in php.ini but not getting any results.
extension=php_
Just copy fbclient.dll and gds32.dll to apache/bin/ folder and restart apache.
This work for me anfter hours of research.
I suggest everyone to use Easyphp Devserver (www.easyphp.org) instead of wamp or xampp specially for connecting on Firebird Database (ibase_connect or pdo).