Uncaught exception RuntimeException with message The mssql extension is not loaded
I am using PHP 5.3.4 as a front end with MSSQL in the back end. I had enabled relevant extension in php.ini
but even then whenever I am accessing MSSQL db from any web page, the pages are terminated with a fatal error as
"Fatal error: Uncaught exception 'RuntimeException' with message 'The "mssql" extension is not loaded' in ..."
Although MSSQL is running fine from MS SQL Server Studio. I am using XAMPP server 2.1 with Windows 11 64 bit OS.