Ricardo Obregón has updated the Firebird PHP 5.3.9 PDO extension in ArchLinux
You can check his tweet and the package page in ArchLinux:
Just updated #php-pdo-firebird package in #ArchLinux User Repo to connect to @FirebirdSQL from PHP 5.3.9. #Firebird http://t.co/XyeaRJE0
If you find this package useful and want to have it in the community repository, please Vote Up!