Why am I getting the 'Call to undefined function mssql_connect()' error when connecting to SQL Server 2008 with PHP 5.3?

PHP Error: "Call to Undefined Function mssql_connect()": A Guide to Connecting to Microsoft SQL Server 2008

When attempting to connect to a SQL Server 2008 instance using PHP 5.3 running on IIS7/Windows Server 2008, you may encounter the error message "PHP Fatal error: Call to undefined function mssql_connect()." This error typically occurs when the required extension is not properly installed or configured.

To address this issue, let's investigate the steps you have taken and identify potential areas of oversight.

1. Extension Installation:

You mentioned downloading and installing SQLSRV30.EXE from Microsoft. Verify that you have added the correct entry to your php.ini file. The extension should be named "php_sqlsrv_53_nts.dll" in the php.ini file. It should be installed in the "ext" directory, typically located at "C:Program Files (x86)PHPext."

2. MSVCRTD.DLL Dependency:

Ensure that "MSVCRTD.DLL" is installed on your system. This DLL is required for the extension to function properly. You can download it from Microsoft's website.

3. Function Naming:

Please note that the function to connect to Microsoft SQL Server using the extension is "sqlsrv_connect()," not "mssql_connect()." Make sure you are using the correct function in your code.

4. Extension Configuration:

Restart the web server after making changes to php.ini to ensure that the extension is loaded. You can check if the extension is enabled by running "phpinfo()" and searching for the "SQLSRV Extension" section.

5. Additional Considerations:

• Check whether the SQLSRV extension has been registered under the correct PHP version.
• Ensure that you have the appropriate permissions to access the SQL Server instance.
• If you receive any additional errors during the connection process, consult the output in your log files for more information.

By following these steps, you should be able to resolve the "Call to undefined function mssql_connect()" error and successfully connect to Microsoft SQL Server 2008 using PHP 5.3.

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