Why am I getting 'Call to undefined function mssql_connect()' when connecting to SQL Server 2008 in PHP on IIS7?

Call to Undefined Function mssql_connect() in PHP on IIS7 with SQL Server 2008

In PHP, connecting to Microsoft SQL Server 2008 requires the use of the mssql_connect() function. However, users may encounter a fatal error stating "Call to undefined function mssql_connect()." This issue typically arises when the necessary extension is not installed or not properly configured.

To resolve this error, check if the SQLSRV extension is installed and enabled. Examine the php.ini file for the following line:

extension=php_sqlsrv_53_nts.dll

If the line is present and uncommented, restart the web server. If not, download and install the extension from Microsoft.

For PHP version 5.3, you must use the sqlsrv_connect() function instead of mssql_connect() to connect to SQL Server 2008. Verify that you are using the correct function name to establish the connection.

Additionally, confirm that the extension_dir directive in the php.ini file points to the correct directory where the extension is installed. By default, it should be "ext."

Lastly, consult the SQLSRV_Help.chm documentation to understand the API for the Microsoft driver. This documentation should be extracted to the ext directory when the extension is installed. By following these steps, you can successfully connect to SQL Server 2008 from PHP on IIS7 with minimal issues.

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