The php84-php-pdo-firebird package contains the PDO driver for Interbase/Firebird databases.
InterBase is the name of the closed-source variant of this RDBMS that was developed by Borland/Inprise.
Firebird is a commercially independent project of C and C++ programmers, technical advisors and supporters developing and enhancing a multi-platform relational database management system based on the source code released by Inprise Corp (now known as Borland Software Corp) under the InterBase Public License.