Why Does My PHP Code Throw a 'Fatal error: Call to undefined function sqlsrv_connect()' Error?

Error: "Fatal error: Call to undefined function sqlsrv_connect()"

This error arises when attempting to connect to SQL Server from a PHP script using the sqlsrv_connect() function, which is undefined. To resolve this issue, ensure that the following steps are taken:

1. Install and Configure PHP Extension:

   • Install the appropriate PHP extension for SQL Server (e.g., php_sqlsrv_54_ts.dll).
   • Add the extension to the php.ini file located in the correct WAMP folder (e.g., C:wampbinphpphp5.4.16).

2. Configure PHP Version:

   • Ensure that the PHP version in the php.ini file matches the version of PHP installed.

3. Restart Apache:

   • Restart Apache to load the updated php.ini file.

4. Verify Extension Installation:

   • Run phpinfo() to check if the sqlsrv extension is listed.

Additional Troubleshooting Tips:

• Compatibility Issues:

  • Confirm that the PHP extension version is compatible with the PHP version, architecture, and compiler used.

• Log Errors:

  • Use the command line to display startup errors and diagnose potential issues (e.g., php -d display_errors).

• Database Server:

  • Ensure that you are connecting to the correct database server (SQL Server 2008 R2 in your case).
  • Verify that the SQL Server service is running and that you have the necessary privileges to connect.

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