Database Extensions
- Abstraction Layers
- Vendor Specific Database Extensions
- CUBRID
- DB++
- dBase
- filePro
- Firebird/InterBase
- FrontBase
- IBM DB2 - IBM DB2, Cloudscape and Apache Derby
- Informix
- Ingres - Ingres DBMS, EDBC, and Enterprise Access Gateways
- MaxDB
- Mongo - MongoDB Native Driver
- mSQL
- Mssql - Microsoft SQL Server
- MySQL
- Mysqli - MySQL Improved Extension
- Mysqlnd - MySQL Native Driver
- mysqlnd_ms - Mysqlnd replication and load balancing plugin
- mysqlnd_qc - Mysqlnd query result cache plugin
- OCI8 - Oracle OCI8
- Ovrimos SQL
- Paradox - Paradox File Access
- PostgreSQL
- SQLite
- SQLite3
- SQLSRV - Microsoft SQL Server Driver for PHP
- Sybase
- tokyo_tyrant