Microsoft SQL Server connections are available in versions 3 and 4 of PHP and connections can be made in several ways. On Win32 platforms, connections can be made using the built-in OBDC functions or via the Microsoft SQL Server extension. For UNIX users, Microsoft SQL Server connections require the compilation of ODBC availability into PHP. A number of ODBC packages are available, including iODBC and freeODBC. In addition, an ODBC bridge may be required to connect, and a commercial version (but free for limited use) is available from OpenLink Software.
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