I am facing below issue Using PhpRad Classic with MS SQL Server database
Could not find driver in \app\models\PDODb.php
I have solved it using below method. Before doing below stop the Apache and MySQL servers from XAMPP control panel and Quit the XAMPP control panel.
Below is the link to download Microsoft Drivers 5.8 for PHP for SQL Server
https://www.microsoft.com/en-us/download/details.aspx?id=100922
Run the downloaded file “SQLSRV58.exe” and click on browse button and select the folder where you extract the extensions files and from these extensions files, copy below extensions files and paste in PHP ext folder of XAMPP folder like it \xampp\php\ext
php_pdo_sqlsrv_74_ts_x64.dll
php_sqlsrv_74_ts_x64.dll
Add below extensions in php.ini file.
extension=php_pdo_sqlsrv_74_ts_x64.dll
extension=php_sqlsrv_74_ts_x64.dll
Run the XAMPP control panel and start the Apache and MySQL servers.
I hope your application ( PHPRad Classic and RadSystems till 8.2.3 version ) is working using MS SQL Server database. 