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Why am I getting a 'Call to undefined function mssql_connect()' error when connecting to SQL Server from PHP?
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:
1
2
3
4
5
SQLSRVSQLSRV support => enabledSQLSRV Info =>SQLSRV Session State => enabledSQLSRV Client Adapter => yesCopy after login
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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