Why am I getting a "Call to undefined function mssql_connect()" error when connecting to SQL Server from PHP?

PHP Fatal Error: Call to Undefined Function mssql_connect()

Issue:
When attempting to connect to SQL Server 2008 from PHP 5.3 running on IIS7/Windows Server 2008, users receive the fatal error "Call to undefined function mssql_connect()."

Resolution:

To resolve this issue, ensure the following:

Proper Extension Configuration:

• Verify that SQLSRV30.EXE is installed in the correct directory (C:Program Files (x86)PHPext) and that the .dll file extension matches the version of PHP (php_sqlsrv_53_nts.dll for PHP 5.3).

• Add the following line to C:Program Files (x86)PHPphp.ini:

  extension=php_sqlsrv_53_nts.dll

• Restart the server to apply the changes.

PHPINFO Verification:

• Access phpinfo() to check if the SQLSRV extension is loaded. Look for a section similar to the following:

  SQLSRV
  SQLSRV support => enabled
  SQLSRV Info => 
  SQLSRV Session State => enabled
  SQLSRV Client Adapter => yes

Correct Function Usage:

• Remember that mssql_connect() is for the Mssql extension, not the Microsoft SQL Server extension (sqlsrv).
• For the Microsoft driver API, use sqlsrv_connect(). Reference SQLSRV_Help.chm in the ext directory for more information.

Extension Directory:

• Check the extension_dir setting in php.ini. If it is not set to "ext," try specifying the full path to the directory:

  extension_dir = "C:PHPext"

• Restart the server after making any changes to the php.ini file.

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