(no version information, might be only in CVS)
PDO_DBLIB DSN -- Connecting to Microsoft SQL Server and Sybase databasesThe PDO_DBLIB Data Source Name (DSN) is composed of the following elements:
The DSN prefix is sybase: if PDO_DBLIB was linked against the FreeTDS libraries, mssql: if PDO_DBLIB was linked against the Microsoft SQL Server libraries, or dblib: if linked against any other variety of DB-lib.
The hostname on which the database server resides.
The name of the database.